iCON Education - Electrochemistry JEE Mains Test

Candidate Name

Student

Exam Name

JEE Mains

Test Name

Electrochemistry

Subject

Chemistry

← Back to Electrochemistry

Remaining Time

02:14:00

Question 1: Palette 1/134

JEE Mains 2026 MCQ

JEE Main 2026 (Online) 23rd January Evening Shift Chemistry - Electrochemistry Question 11 English

Consider the above electrochemical cell where a metal electrode ( M ) is undergoing redox reaction by forming $\mathrm{M}^{+}\left(\mathrm{M} \rightarrow \mathrm{M}^{+}+\mathrm{e}^{-}\right)$. The cation $\mathrm{M}^{+}$is present in two different concentrations $c_1$ and $c_2$ as shown above. Which of the following statement is correct for generating a positive cell potential?

If $c_1$ is present at anode, then $c_1>c_2$.

If $c_1$ is present at cathode, then $c_1>c_2$.

If $c_1$ is present at cathode, then $c_1

If $c_1$ is present at anode, then $c_1=c_2$.

Question 2: Palette 2/134

JEE Mains 2026 MCQ

In the given electrochemical cell, $\mathrm{Ag}(\mathrm{s})|\mathrm{AgCl}(\mathrm{s})| \mathrm{FeCl}_2(\mathrm{aq}), \mathrm{FeCl}_3(\mathrm{aq}) \mid \mathrm{Pt}(\mathrm{s})$ at 298 K , the cell potential ( $\mathrm{E}_{\text {cell }}$ ) will increase when :

A. Concentration of $\mathrm{Fe}^{2+}$ is increased.

B. Concentration of $\mathrm{Fe}^{3+}$ is decreased.

C. Concentration of $\mathrm{Fe}^{2+}$ is decreased.

D. Concentration of $\mathrm{Fe}^{3+}$ is increased.

E. Concentration of $\mathrm{Cl}^{-}$is increased.

Choose the correct answer from the options given below :

C, D and E Only

A and B Only

B Only

A and E Only

Question 3: Palette 3/134

JEE Mains 2026 MCQ

Consider the following reduction processes :

$ \begin{aligned} & \mathrm{Al}^{3+}+3 \mathrm{e}^{-} \longrightarrow \mathrm{Al}(\mathrm{~s}), \mathrm{E}^0=-1.66 \mathrm{~V} \\ & \mathrm{Fe}^{3+}+\mathrm{e}^{-} \longrightarrow \mathrm{Fe}^{2+}, \mathrm{E}^0=+0.77 \mathrm{~V} \\ & \mathrm{Co}^{3+}+\mathrm{e}^{-} \longrightarrow \mathrm{Co}^{2+}, \mathrm{E}^0=+1.81 \mathrm{~V} \\ & \mathrm{Cr}^{3+}+3 \mathrm{e}^{-} \longrightarrow \mathrm{Cr}(\mathrm{~s}), \mathrm{E}^0=-0.74 \mathrm{~V} \end{aligned} $

The tendency to act as reducing agent decreases in the order :

$\mathrm{Al}>\mathrm{Fe}^{2+}>\mathrm{Cr}>\mathrm{Co}^{2+}$

$\mathrm{Al}>\mathrm{Cr}>\mathrm{Co}^{2+}>\mathrm{Fe}^{2+}$

$\mathrm{Cr}>\mathrm{Fe}^{2+}>\mathrm{Al}>\mathrm{Co}^{2+}$

$\mathrm{Al}>\mathrm{Cr}>\mathrm{Fe}^{2+}>\mathrm{Co}^{2+}$

Question 4: Palette 4/134

JEE Mains 2026 MCQ

For a closed circuit Daniell cell, which of the following plots is the accurate one at a given temperature?

JEE Main 2026 (Online) 21st January Evening Shift Chemistry - Electrochemistry Question 21 English Option 1

JEE Main 2026 (Online) 21st January Evening Shift Chemistry - Electrochemistry Question 21 English Option 2

JEE Main 2026 (Online) 21st January Evening Shift Chemistry - Electrochemistry Question 21 English Option 3

JEE Main 2026 (Online) 21st January Evening Shift Chemistry - Electrochemistry Question 21 English Option 4

Question 5: Palette 5/134

JEE Mains 2026 MCQ

Given at 298 K :

$ \begin{aligned} & \mathrm{E}_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^{\ominus}=\mathrm{X} \text { Volt } \\ & \mathrm{E}_{\mathrm{Fe}^{3+} / \mathrm{Fe}}^{\ominus}=\mathrm{Y} \text { Volt } \end{aligned} $

The $\mathrm{E}_{\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}}^{\ominus}$ in Volt at 298 K is given by :

$2 \mathrm{X}-3 \mathrm{Y}$

$3 Y-2 X$

$3 \mathrm{Y}+2 \mathrm{X}$

$Y+X$

Question 6: Palette 6/134

JEE Mains 2026 MCQ

For a general redox reaction

Anode $\quad \operatorname{Red}_1 \rightarrow \mathrm{Ox}_1^{\mathrm{n}_1^{+}}+\mathrm{n}_1 \mathrm{e}^{-}$

Cathode $\mathrm{O} x_2+\mathrm{n}_2 \mathrm{e}^{-} \rightarrow \operatorname{Red}_2^{\mathrm{n}_2-}$

Which of the following statement is incorrect?

$ \begin{aligned} & \text { The overall reaction can be written as } \mathrm{n}_2 \operatorname{Red}_1+\mathrm{n}_1 \mathrm{O} x_2 \rightleftharpoons \mathrm{n}_2 \mathrm{O} x_1^{\mathrm{n}_1^{+}}+\mathrm{n}_1 \operatorname{Red}_2^{\mathrm{n}_2^{-}} \\ & \text {} \end{aligned} $

The electrons do not appear in the overall reaction because electrons produced at the anode are consumed at the cathode.

JEE Main 2026 (Online) 6th April Evening Shift Chemistry - Electrochemistry Question 5 English Option 2

Here $n$ is the number of electrons transferred in redox reaction.

If the reaction is carried out reversibly, the electrical work done is equal to the ratio of charge and potential difference through which charge is moved.

Question 7: Palette 7/134

JEE Mains 2026 MCQ

$ \text { Consider the following data. } $

$ \begin{array}{|c|c|} \hline \text { Electrolyte } & \wedge^{\circ}_\mathbf{m}{\mathbf{(}} \mathbf{S ~ c m}^{\mathbf{2}} \mathbf{~ m o l}^{\mathbf{1}} \mathbf{)} \\ \hline \mathrm{BaCl}_2 & x_1 \\ \hline \mathrm{H}_2 \mathrm{SO}_4 & x_2 \\ \hline \mathrm{HCl} & x_3 \\ \hline \end{array} $

$\mathrm{BaSO}_4$ is sparingly soluble in water. If the conductivity of the saturated $\mathrm{BaSO}_4$ solution is $x \mathrm{~S} \mathrm{~cm}^{-1}$ then the solubility product of $\mathrm{BaSO}_4$ can be given as (Here $\wedge_{\mathrm{m}}=\wedge^{\circ}_{\mathrm{m}}$ )

$\frac{10^6 x^2}{\alpha^2\left(x_1+x_2-2 x_3\right)^2}$

$ \frac{x^2}{\left(x_1+x_2-2 x_3\right)^2} $

$ \frac{\alpha^2\left(x_1+x_2-2 x_3\right)^2}{10^6 x^2} $

$ \frac{x^2}{\left(x_1+x_2+2 x_3\right)^2} $

Question 8: Palette 8/134

JEE Mains 2026 MCQ

One half cell in a voltaic cell is constructed by dipping silver rod in $\mathrm{AgNO}_3$ solution of unknown concentration, other half cell is Zn rod dipped in 1 molar solution of $\mathrm{ZnSO}_4$.

A voltage of 1.60 V is measured at 298 K for this cell. What is the concentration of $\mathrm{Ag}^{+}$ions used in terms of $\log x\left(x=\left[\mathrm{Ag}^{+}\right]\right)$?

$ \mathrm{E}_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\ominus}=-0.76 \mathrm{~V}, \quad \mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\ominus}=+0.80 \mathrm{~V}, \frac{2.303 \mathrm{RT}}{\mathrm{~F}}=0.059 \mathrm{~V} $

$\frac{2}{3.9}$

$\frac{4}{5.9}$

$\frac{2.9}{2}$

$\frac{5.9}{4}$

Question 9: Palette 9/134

JEE Mains 2026 MCQ

An electrochemical cell is constructed using half cells in the direction of spontaneous change:

Fe(OH)₂(s) + 2e⁻ → Fe(s) + 2OH⁻(aq) E^θ = −0.88 V

and AgBr(s) + e⁻ → Ag(s) + Br⁻(aq) E^θ = +0.07 V

Which of the following option is correct?

$ \text { Overall reaction } \mathrm{Fe}(\mathrm{~s})+2 \mathrm{OH}^{-}(\mathrm{aq})+2 \mathrm{AgBr}(\mathrm{~s}) \rightleftharpoons \mathrm{Fe}(\mathrm{OH})_2(\mathrm{~s})+2 \mathrm{Ag}(\mathrm{~s})+2 \mathrm{Br}^{-}(\mathrm{aq}) $

$E_{cell}^{\theta} = -0.95 \ V$

Fe is reduced in the electrochemical cell

$E_{cell}^{\theta}$ is an extensive property

Question 10: Palette 10/134

JEE Mains 2025 MCQ

Given below are two statements :

1 M aqueous solutions of each of Cu(NO₃)₂, AgNO₃, Hg₂(NO₃)₂, Mg(NO₃)₂ are electrolysed using inert electrodes. Given: E⁰_Ag⁺/Ag = 0.80 V, E⁰_{Hg₂²⁺/Hg} = 0.79 V, E⁰_Cu²⁺/Cu = 0.24 V and E⁰_Mg²⁺/Mg = -2.37 V.

Statement (I) : With increasing voltage, the sequence of deposition of metals on the cathode will be Ag, Hg and Cu.

Statement (II) : Magnesium will not be deposited at the cathode instead oxygen gas will be evolved at the cathode.

In the light of the above statements, choose the most appropriate answer from the options given below :

Both Statement I and Statement II are incorrect

Statement I is incorrect but Statement II is correct

Statement I is correct but Statement II is incorrect

Both Statement I and Statement II are correct

Question 11: Palette 11/134

JEE Mains 2025 MCQ

On charging the lead storage battery, the oxidation state of lead changes from $x_1$ to $y_1$ at the anode and from $x_2$ to $y_2$ at the cathode. The values of $x_1, y_1, x_2, y_2$ are respectively :

$0,+2,+4,+2$

$+2,0,0,+4$

$+4,+2,0,+2$

$+2,0,+2,+4$

Question 12: Palette 12/134

JEE Mains 2025 MCQ

The standard cell potential $\left(\mathrm{E}_{\text {cell }}^{\ominus}\right)$ of a fuel cell based on the oxidation of methanol in air that has been used to power television relay station is measured as 1.21 V . The standard half cell reduction potential for $\mathrm{O}_2\left(\mathrm{E}_{\mathrm{O}_2 / \mathrm{H}_2 \mathrm{O}}^{\circ}\right)$ is 1.229 V .

Choose the correct statement :

Reactants are fed at one go to each electrode.

Oxygen is formed at the anode.

The standard half cell reduction potential for the reduction of $\mathrm{CO}_2\left(\mathrm{E}_{\mathrm{CO}_2 / \mathrm{CH}_3 \mathrm{OH}}^{\circ}\right)$ is 19 mV

Reduction of methanol takes place at the cathode.

Question 13: Palette 13/134

JEE Mains 2025 MCQ

Correct order of limiting molar conductivity for cations in water at 298 K is :

$\mathrm{H}^{+}>\mathrm{Na}^{+}>\mathrm{K}^{+}>\mathrm{Ca}^{2+}>\mathrm{Mg}^{2+}$

$\mathrm{H}^{+}>\mathrm{Ca}^{2+}>\mathrm{Mg}^{2+}>\mathrm{K}^{+}>\mathrm{Na}^{+}$

$\mathrm{Mg}^{2+}>\mathrm{H}^{+}>\mathrm{Ca}^{2+}>\mathrm{K}^{+}>\mathrm{Na}^{+}$

$\mathrm{H}^{+}>\mathrm{Na}^{+}>\mathrm{Ca}^{2+}>\mathrm{Mg}^{2+}>\mathrm{K}^{+}$

Question 14: Palette 14/134

JEE Mains 2025 MCQ

Match List - I with List - II :

List - I (Applications)	List - II (Batteries/Cell)
(A) Transistors	(I) Anode - Zn/Hg; Cathode - HgO + C
(B) Hearing aids	(II) Hydrogen fuel cell
(C) Inverters	(III) Anode - Zn; Cathode - Carbon
(D) Apollo space ship	(IV) Anode - Pb; Cathode - Pb \| PbO₂

Choose the correct answer from the options given below :

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

(A)-(II), (B)-(III), (C)-(IV), (D)-(I)

(A)-(IV), (B)-(III), (C)-(II), (D)-(I)

(A)-(III), (B)-(II), (C)-(IV), (D)-(I)

Question 15: Palette 15/134

JEE Mains 2025 MCQ

$\mathrm{O}_2$ gas will be evolved as a product of electrolysis of :

(A) an aqueous solution of $\mathrm{AgNO}_3$ using silver electrodes.

(B) an aqueous solution of $\mathrm{AgNO}_3$ using platinum electrodes.

(D) a high concentration solution of $\mathrm{H}_2 \mathrm{SO}_4$ using platinum electrodes.

Choose the correct answer from the options given below :

(B) and (C) only

(B) and (D) only

(A) and (D) only

$(A)$ and $(C)$ only

Question 16: Palette 16/134

JEE Mains 2025 MCQ

For a Mg | Mg²⁺ (aq) || Ag⁺ (aq) | Ag the correct Nernst Equation is :

$\mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\mathrm{o}}-\frac{\mathrm{RT}}{2 \mathrm{~F}} \ln \frac{\left[\mathrm{Ag}^{+}\right]^2}{\left[\mathrm{Mg}^{2+}\right]}$

$\mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\mathrm{o}}-\frac{\mathrm{RT}}{2 \mathrm{~F}} \ln \frac{\left[\mathrm{Mg}^{2+}\right]}{\left[\mathrm{Ag}^{+}\right]}$

$\mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\mathrm{o}}-\frac{\mathrm{RT}}{2 \mathrm{~F}} \ln \frac{\left[\mathrm{Ag}^{+}\right]}{\left[\mathrm{Mg}^{2+}\right]}$

$\mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\mathrm{o}}+\frac{\mathrm{RT}}{2 \mathrm{~F}} \ln \frac{\left[\mathrm{Ag}^{+}\right]^2}{\left[\mathrm{Mg}^{2+}\right]}$

Question 17: Palette 17/134

JEE Mains 2025 MCQ

The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed?

Molar conductivity increases sharply with increase in concentration.

Molar conductivity decreases sharply with increase in concentration.

A small increase in molar conductivity is observed at infinite dilution.

A small decrease in molar conductivity is observed at infinite dilution.

Question 18: Palette 18/134

JEE Mains 2025 MCQ

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.

$E^o_{\text{Sn}^{4+}/\text{Sn}^{2+}} = +1.15 \text{ V}$

$E^o_{\text{Al}^{3+}/\text{Al}} = -1.66 \text{ V}$

$E^o_{\text{Pb}^{4+}/\text{Pb}^{2+}} = +1.67 \text{ V}$

$E^o_{\text{Tl}^{3+}/\text{Tl}} = +1.26 \text{ V}$

Question 19: Palette 19/134

JEE Mains 2025 MCQ

Based on the data given below :

$\begin{array}{ll} \mathrm{E}_{\mathrm{Cr}_2 \mathrm{O}_7^{2-} / \mathrm{Cr}^{3+}}^{\circ}=1.33 \mathrm{~V} & \mathrm{E}_{\mathrm{Cl}_2 / \mathrm{Cl}^{(-)}}^{\circ}=1.36 \mathrm{~V} \\ \mathrm{E}_{\mathrm{MnO}_4^{-} / \mathrm{Mn}^{2+}}^0=1.51 \mathrm{~V} & \mathrm{E}_{\mathrm{Cr}^{3+} / \mathrm{Cr}}^{\circ}=-0.74 \mathrm{~V} \end{array}$

the strongest reducing agent is :

$\mathrm{Cl}^{-}$

$\mathrm{MnO}_4^{-}$

$\mathrm{Cr}$

$\mathrm{Mn}^{2+}$

Question 20: Palette 20/134

JEE Mains 2025 MCQ

For the given cell

$\mathrm{Fe}^{2+}(\mathrm{aq})+\mathrm{Ag}_{(\mathrm{aq})}^{+} \rightarrow \mathrm{Fe}^{3+}(\mathrm{aq})+\mathrm{Ag}_{(\mathrm{s})}$

The standard cell potential of the above reaction is Given:

$\begin{array}{lr} \mathrm{Ag}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Ag} & \mathrm{E}^\theta=\mathrm{xV} \\ \mathrm{Fe}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Fe} & \mathrm{E}^\theta=\mathrm{yV} \\ \mathrm{Fe}^{3+}+3 \mathrm{e}^{-} \rightarrow \mathrm{Fe} & \mathrm{E}^\theta=\mathrm{zV} \end{array}$

$x+2 y-3 z$

$x+2 y$

$y-2 x$

$x+y-z$

Question 21: Palette 21/134

JEE Mains 2025 MCQ

Standard electrode potentials for a few half cells are mentioned below :

$\begin{aligned} & \mathrm{E}_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\circ}=0.34 \mathrm{~V}, \mathrm{E}_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\circ}=-0.76 \mathrm{~V} \\ & \mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\circ}=0.80 \mathrm{~V}, \mathrm{E}_{\mathrm{Mg}^{2+} / \mathrm{Mg}}^{\circ}=-2.37 \mathrm{~V} \end{aligned}$

Which one of the following cells gives the most negative value of $\Delta \mathrm{G}^{\circ}$ ?

$\mathrm{Zn}\left|\mathrm{Zn}^{2+}(1 \mathrm{M}) \| \mathrm{Ag}^{+}(1 \mathrm{M})\right| \mathrm{Ag}$

$\mathrm{Ag}\left|\mathrm{Ag}^{+}(1 \mathrm{M})\right|\left|\mathrm{Mg}^{2+}(1 \mathrm{M})\right| \mathrm{Mg}$

$\mathrm{Zn}\left|\mathrm{Zn}^{2+}(1 \mathrm{M})\right|\left|\mathrm{Mg}^{2+}(1 \mathrm{M})\right| \mathrm{Mg}$

$\mathrm{Cu}\left|\mathrm{Cu}^{2+}(1 \mathrm{M})\right|\left|\mathrm{Ag}^{+}(1 \mathrm{M})\right| \mathrm{Ag}$

Question 22: Palette 22/134

JEE Mains 2025 MCQ

$ \mathrm{FeO}_4^{2-} \xrightarrow{+2.0 \mathrm{~V}} \mathrm{Fe}^{3+} \xrightarrow{0.8 \mathrm{~V}} \mathrm{Fe}^{2+} \xrightarrow{-0.5 \mathrm{~V}} \mathrm{Fe}^0 $

In the above diagram, the standard electrode potentials are given in volts (over the arrow).

The value of $\mathrm{E}_{\mathrm{FeO}_4^{2-} / \mathrm{Fe}^{2+}}$ is :

1.2 V

2.1 V

1.4 V

1.7 V

Question 23: Palette 23/134

JEE Mains 2025 MCQ

Given below are two statements :

Statement (I) : Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure metal as a cathode.

Statement (II) : The rate of corrosion is more in alkaline medium than in acidic medium.

In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Question 24: Palette 24/134

JEE Mains 2025 MCQ

Which of the following electrolyte can be used to obtain $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$ by the process of electrolysis ?

Concentrated solution of sulphuric acid

Dilute solution of sodium sulphate.

Acidified dilute solution of sodium sulphate.

Dilute solution of sulphuric acid

Question 25: Palette 25/134

JEE Mains 2025 MCQ

A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A . The amount of the aluminium deposited at the cathode is __________ .

[Given : molar mass of aluminium and chlorine are $27 \mathrm{~g} \mathrm{~mol}^{-1}$ and $35.5 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively. Faraday constant $\left.=96500 \mathrm{C} \mathrm{~mol}^{-1}\right]$

1.660 g

1.007 g

0.336 g

0.441 g

Question 26: Palette 26/134

JEE Mains 2024 MCQ

Match List I with List II

	LIST I (Cell)		LIST II (Use/Property/Reaction)
A.	Leclanche cell	I.	Converts energy of combustion into electrical energy
B.	Ni - Cd cell	II.	Does not involve any ion in solution and is used in hearing aids
C.	Fuel cell	III.	Rechargeable
D.	Mercury cell	IV.	Reaction at anode $\mathrm{Zn} \rightarrow \mathrm{Zn}^{2+}+2 \mathrm{e}^{-}$

Choose the correct answer from the options given below :

A-III, B-I, C-IV, D-II

A-I, B-II, C-III, D-IV

A-IV, B-III, C-I, D-II

A-II, B-III, C-IV, D-I

Question 27: Palette 27/134

JEE Mains 2024 MCQ

Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for a weak electrolyte, if the symbols carry their usual meaning :

$\Lambda_{\mathrm{m}}-\Lambda_{\mathrm{m}}^{\circ}+\mathrm{AC}^{\frac{1}{2}}=0$

$\Lambda_{\mathrm{m}}^2 \mathrm{C}+\mathrm{K}_{\mathrm{a}} \Lambda_{\mathrm{m}}^{\mathrm{o}^2}-\mathrm{K}_{\mathrm{a}} \Lambda_{\mathrm{m}} \Lambda_{\mathrm{m}}^{\circ}=0$

$\Lambda_{\mathrm{m}}-\Lambda_{\mathrm{m}}^{\circ}-\mathrm{AC}^{\frac{1}{2}}=0$

$\Lambda_{\mathrm{m}}^2 \mathrm{C}-\mathrm{K}_{\mathrm{a}} \Lambda_{\mathrm{m}}^{\circ 2}+\mathrm{K}_{\mathrm{a}} \Lambda_{\mathrm{m}} \Lambda_{\mathrm{m}}^{\circ}=0$

Question 28: Palette 28/134

JEE Mains 2024 MCQ

The molar conductivity for electrolytes $A$ and $B$ are plotted against $C^{3 / 2}$ as shown below. Electrolytes $A$ and $B$ respectively are:

JEE Main 2024 (Online) 9th April Morning Shift Chemistry - Electrochemistry Question 57 English

A - weak electrolyte $\quad$ B - weak electrolyte

A - weak electrolyte $\quad$ B - strong electrolyte

A - strong electrolyte $\quad$ B - strong electrolyte

A - strong electrolyte $\quad$ B - weak electrolyte

Question 29: Palette 29/134

JEE Mains 2024 MCQ

The emf of cell $\mathrm{Tl}\left|\underset{(0.001 \mathrm{M})}{\mathrm{Tl}^{+}}\right| \underset{(0.01 \mathrm{M})}{\mathrm{Cu}^{2+}} \mid \mathrm{Cu}$ is $0.83 \mathrm{~V}$ at $298 \mathrm{~K}$. It could be increased by :

increasing concentration of $\mathrm{Tl}^{+}$ ions

increasing concentration of $\mathrm{Cu}^{2+}$ ions

increasing concentration of both $\mathrm{Tl}^{+}$ and $\mathrm{Cu}^{2+}$ ions

decreasing concentration of both $\mathrm{Tl}^{+}$ and $\mathrm{Cu}^{2+}$ ions

Question 30: Palette 30/134

JEE Mains 2024 MCQ

The reaction;

$\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})}+\mathrm{AgCl}_{(\mathrm{s})} \rightarrow \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Ag}_{(\mathrm{s})}$

occurs in which of the following galvanic cell :

$\mathrm{Pt}\left|\mathrm{H}_{2(\mathrm{~g})}\right| \mathrm{HCl}_{(\text {soln.) }}\left|\mathrm{AgNO}_{3(\mathrm{aq})}\right| \mathrm{Ag}$

$\mathrm{Ag}\left|\mathrm{AgCl}_{(\mathrm{s})}\right| \mathrm{KCl}_{\text {(soln.) }}\left|\mathrm{AgNO}_{3 \text { (aq.) }}\right| \mathrm{Ag}$

$\mathrm{Pt}\left|\mathrm{H}_{2(\mathrm{~g})}\right| \mathrm{KCl}_{(\text {soln.) }}\left|\mathrm{AgCl}_{(\mathrm{s})}\right| \mathrm{Ag}$

$\mathrm{Pt}\left|\mathrm{H}_{2(\mathrm{~g})}\right| \mathrm{HCl}_{(\text {soln. })}\left|\mathrm{AgCl}_{(\mathrm{s})}\right| \mathrm{Ag}$

Question 31: Palette 31/134

JEE Mains 2024 MCQ

Given below are two statements :

Statement (I) : Fusion of $\mathrm{MnO}_2$ with $\mathrm{KOH}$ and an oxidising agent gives dark green $\mathrm{K}_2 \mathrm{MnO}_4$.

Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.

In the light of the above statements, choose the correct answer from the options given below :

Statement I is false but Statement II is true

Statement I is true but Statement II is false

Both Statement I and Statement II are false

Both Statement I and Statement II are true

Question 32: Palette 32/134

JEE Mains 2024 MCQ

How can an electrochemical cell be converted into an electrolytic cell ?

Applying an external opposite potential greater than $\mathrm{E}_{\text {cell }}^0$

Exchanging the electrodes at anode and cathode.

Applying an external opposite potential lower than $\mathrm{E}^0{ }_{\text {cell }}$

Reversing the flow of ions in salt bridge.

Question 33: Palette 33/134

JEE Mains 2024 MCQ

A conductivity cell with two electrodes (dark side) are half filled with infinitely dilute aqueous solution of a weak electrolyte. If volume is doubled by adding more water at constant temperature, the molar conductivity of the cell will -

JEE Main 2024 (Online) 6th April Morning Shift Chemistry - Electrochemistry Question 44 English

depend upon type of electrolyte

increase sharply

decrease sharply

remain same or can not be measured accurately

Question 34: Palette 34/134

JEE Mains 2024 MCQ

The quantity of silver deposited when one coulomb charge is passed through $\mathrm{AgNO}_3$ solution :

$0.1 \mathrm{~g}$ atom of silver

1 chemical equivalent of silver

$1 \mathrm{~g}$ of silver

1 electrochemical equivalent of silver

Question 35: Palette 35/134

JEE Mains 2024 MCQ

For the electro chemical cell

$\mathrm{M}\left|\mathrm{M}^{2+}\right||\mathrm{X}| \mathrm{X}^{2-}$

If $\mathrm{E}_{\left(\mathrm{M}^{2+} / \mathrm{M}\right)}^0=0.46 \mathrm{~V}$ and $\mathrm{E}_{\left(\mathrm{x} / \mathrm{x}^{2-}\right)}^0=0.34 \mathrm{~V}$.

Which of the following is correct?

$\mathrm{E}_{\mathrm{cell}}=0.80 \mathrm{~V}$

$\mathrm{M}+\mathrm{X} \rightarrow \mathrm{M}^{2+}+\mathrm{X}^{2-}$ is a spontaneous reaction

$\mathrm{E}_{\text {cell }}=-0.80 \mathrm{~V}$

$\mathrm{M}^{2+}+\mathrm{X}^{2-} \rightarrow \mathrm{M}+\mathrm{X}$ is a spontaneous reaction

Question 36: Palette 36/134

JEE Mains 2024 MCQ

Molar ionic conductivities of divalent cation and anion are $57 \mathrm{~S~cm}^2 \mathrm{~mol}^{-1}$ and $73 \mathrm{~S~cm}^2 \mathrm{~mol}^{-1}$ respectively. The molar conductivity of solution of an electrolyte with the above cation and anion will be:

$187 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$

$260 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$

$65 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$

$130 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$

Question 37: Palette 37/134

JEE Mains 2024 MCQ

The reaction at cathode in the cells commonly used in clocks involves.

oxidation of $\mathrm{Mn}$ from +2 to +7

reduction of $\mathrm{Mn}$ from +4 to +3

oxidation of $\mathrm{Mn}$ from +3 to +4

reduction of $\mathrm{Mn}$ from +7 to +2

Question 38: Palette 38/134

JEE Mains 2024 MCQ

Fuel cell, using hydrogen and oxygen as fuels,

A. has been used in spaceship

B. has as efficiency of $40 \%$ to produce electricity

C. uses aluminum as catalysts

D. is eco-friendly

E. is actually a type of Galvanic cell only

Choose the correct answer from the options given below:

A, D, E only

A, B, C only

A, B, D only

A, B, D, E only

Question 39: Palette 39/134

JEE Mains 2024 MCQ

For a strong electrolyte, a plot of molar conductivity against (concentration) ${ }^{1 / 2}$ is a straight line, with a negative slope, the correct unit for the slope is

$\mathrm{S} \mathrm{cm}^2 \mathrm{~mol}^{-3 / 2} \mathrm{~L}$

$\mathrm{S} \mathrm{cm}{ }^2 \mathrm{~mol}^{-3 / 2} \mathrm{~L}^{-1 / 2}$

$\mathrm{S} \mathrm{cm}{ }^2 \mathrm{~mol}^{-1} \mathrm{~L}^{1 / 2}$

$\mathrm{S} \mathrm{cm}^2 \mathrm{~mol}^{-3 / 2} \mathrm{~L}^{1 / 2}$

Question 40: Palette 40/134

JEE Mains 2024 MCQ

One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?

Metal ion - Metal electrodes

Oxidation - Reduction electrodes

Metal - Insoluble Salt - Anion electrodes

Gas - Ion electrodes

Question 41: Palette 41/134

JEE Mains 2024 MCQ

What pressure (bar) of $\mathrm{H}_2$ would be required to make emf of hydrogen electrode zero in pure water at $25^{\circ} \mathrm{C}$ ?

0.5

$10^{-14}$

$10^{-7}$

Question 42: Palette 42/134

JEE Mains 2024 MCQ

Identify the factor from the following that does not affect electrolytic conductance of a solution.

The nature of solvent used.

The nature of the electrolyte added.

The nature of the electrode used.

Concentration of the electrolyte.

Question 43: Palette 43/134

JEE Mains 2024 MCQ

Alkaline oxidative fusion of $\mathrm{MnO}_2$ gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are

$\mathrm{Mn}_2 \mathrm{O}_3$ and $\mathrm{MnO}_4^{2-}$

$\mathrm{Mn}_2 \mathrm{O}_7$ and $\mathrm{MnO}_4^{-}$

$\mathrm{MnO}_4^{2-}$ and $\mathrm{MnO}_4^{-}$

$\mathrm{MnO}_4^{2-}$ and $\mathrm{Mn}_2 \mathrm{O}_7$

Question 44: Palette 44/134

JEE Mains 2024 MCQ

Reduction potential of ions are given below:

$\begin{array}{ccc} \mathrm{ClO}_4^{-} & \mathrm{IO}_4^{-} & \mathrm{BrO}_4^{-} \\ \mathrm{E}^{\circ}=1.19 \mathrm{~V} & \mathrm{E}^{\circ}=1.65 \mathrm{~V} & \mathrm{E}^{\circ}=1.74 \mathrm{~V} \end{array}$

The correct order of their oxidising power is :

$\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}$

$\mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}$

$\mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}$

$\mathrm{BrO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{ClO}_4^{-}$

Question 45: Palette 45/134

JEE Mains 2024 MCQ

Which of the following statements is not correct about rusting of iron?

Rusting of iron is envisaged as setting up of electrochemical cell on the surface of iron object.

Dissolved acidic oxides $\mathrm{SO}_2, \mathrm{NO}_2$ in water act as catalyst in the process of rusting.

Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.

When $\mathrm{pH}$ lies above 9 or 10, rusting of iron does not take place.

Question 46: Palette 46/134

JEE Mains 2023 MCQ

For lead storage battery pick the correct statements

A. During charging of battery, $\mathrm{PbSO}_{4}$ on anode is converted into $\mathrm{PbO}_{2}$

B. During charging of battery, $\mathrm{PbSO}_{4}$ on cathode is converted into $\mathrm{PbO}_{2}$

C. Lead storage battery consists of grid of lead packed with $\mathrm{PbO}_{2}$ as anode

D. Lead storage battery has $\sim 38 \%$ solution of sulphuric acid as an electrolyte

Choose the correct answer from the options given below:

A, B, D only

B, C only

B, C, D only

B, D only

Question 47: Palette 47/134

JEE Mains 2023 MCQ

The reaction

$\frac{1}{2} \mathrm{H}_{2}(\mathrm{~g})+\mathrm{AgCl}(\mathrm{s}) \rightleftharpoons \mathrm{H}^{+}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq})+\mathrm{Ag}(\mathrm{s})$

occurs in which of the given galvanic cell.

$\mathrm{Ag}|\mathrm{AgCl}(\mathrm{s})| \mathrm{KCl}\left(\mathrm{sol}^{\mathrm{n}}\right)\left|\mathrm{AgNO}_{3}\right| \mathrm{Ag}$

$\mathrm{Pt}\left|\mathrm{H}_{2}(\mathrm{~g})\right| \mathrm{HCl}\left(\mathrm{sol}^{\mathrm{n}}\right)|\mathrm{AgCl}(\mathrm{s})| \mathrm{Ag}$

$\mathrm{Pt}\left|\mathrm{H}_{2}(\mathrm{~g})\right| \mathrm{HCl}\left(\mathrm{sol}^{\mathrm{n}}\right)\left|\mathrm{AgNO}_{3}\left(\mathrm{sol}^{\mathrm{n}}\right)\right| \mathrm{Ag}$

$\mathrm{Pt}\left|\mathrm{H}_{2}(\mathrm{~g})\right| \mathrm{KCl}\left(\mathrm{sol}^{\mathrm{n}}\right)|\mathrm{AgCl}(\mathrm{s})| \mathrm{Ag}$

Question 48: Palette 48/134

JEE Mains 2023 MCQ

The standard electrode potential of $\mathrm{M}^{+} / \mathrm{M}$ in aqueous solution does not depend on

Ionisation of a gaseous metal atom

Sublimation of a solid metal

Ionisation of a solid metal atom

Hydration of a gaseous metal ion

Question 49: Palette 49/134

JEE Mains 2023 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A) : An aqueous solution of $\mathrm{KOH}$ when used for volumetric analysis, its concentration should be checked before the use.

Reason (R) : On aging, $\mathrm{KOH}$ solution absorbs atmospheric $\mathrm{CO}_{2}$.

In the light of the above statements, choose the correct answer from the options given below :

(A) is correct but (R) is not correct

(A) is not correct but (R) is correct

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

Both (A) and (R) are correct and (R) is the correct explanation of (A)

Question 50: Palette 50/134

JEE Mains 2023 MCQ

Which one of the following statements is correct for electrolysis of brine solution?

$\mathrm{O}_{2}$ is formed at cathode

$\mathrm{H}_{2}$ is formed at anode

$\mathrm{Cl}_{2}$ is formed at cathode

$\mathrm{OH}^{-}$ is formed at cathode

Question 51: Palette 51/134

JEE Mains 2023 MCQ

The standard electrode potential $\mathrm{(M^{3+}/M^{2+})}$ for V, Cr, Mn & Co are $-$0.26 V, $-$0.41 V, + 1.57 V and + 1.97 V, respectively. The metal ions which can liberate $\mathrm{H_2}$ from a dilute acid are :

$\mathrm{Mn^{2+}}$ and $\mathrm{Co^{2+}}$

$\mathrm{V^{2+}}$ and $\mathrm{Mn^{2+}}$

$\mathrm{V^{2+}}$ and $\mathrm{Cr^{2+}}$

$\mathrm{Cr^{2+}}$ and $\mathrm{Co^{2+}}$

Question 52: Palette 52/134

JEE Mains 2023 MCQ

Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 89 English Option 1

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 89 English Option 2

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 89 English Option 3

JEE Main 2023 (Online) 24th January Evening Shift Chemistry - Electrochemistry Question 89 English Option 4

Question 53: Palette 53/134

JEE Mains 2022 MCQ

Match List - I with List - II.

	List - I		List - II
(A)	$Cd(s) + 2Ni{(OH)_3}(s) \to CdO(s) + 2Ni{(OH)_2}(s) + {H_2}O(l)$	(I)	Primary battery
(B)	$Zn(Hg) + HgO(s) \to ZnO(s) + Hg(l)$	(II)	Discharging of secondary battery
(C)	$2PbS{O_4}(s) + 2{H_2}O(l) \to Pb(s) + Pb{O_2}(s) + 2{H_2}S{O_4}(aq)$	(III)	Fuel cell
(D)	$2{H_2}(g) + {O_2}(g) \to 2{H_2}O(l)$	(IV)	Charging of secondary battery

Choose the correct answer from the options given below:

$(\mathrm{A})-(\mathrm{I}),(\mathrm{B})-(\mathrm{II}),(\mathrm{C})-(\mathrm{III}),(\mathrm{D})-(\mathrm{IV})$

$(\mathrm{A})-(\mathrm{IV}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{II}),(\mathrm{D})-(\mathrm{III})$

$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{IV}),(\mathrm{D})-(\mathrm{III})$

$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{III}),(\mathrm{D})-(\mathrm{IV})$

Question 54: Palette 54/134

JEE Mains 2022 MCQ

Given below are two statements :

Statement I : For KI, molar conductivity increases steeply with dilution

Statement II : For carbonic acid, molar conductivity increases slowly with dilution

In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Question 55: Palette 55/134

JEE Mains 2022 MCQ

The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is ${\Lambda _{m1}}$ and that of 20 moles another identical cell heaving 80 mL NaCl solution is ${\Lambda _{m2}}$. The conductivities exhibited by these two cells are same. The relationship between ${\Lambda _{m2}}$ and ${\Lambda _{m1}}$ is

${\Lambda _{m2}}$ = 2${\Lambda _{m1}}$

${\Lambda _{m2}}$ = ${\Lambda _{m1}}$ / 2

${\Lambda _{m2}}$ = ${\Lambda _{m1}}$

${\Lambda _{m2}}$ = 4${\Lambda _{m1}}$

Question 56: Palette 56/134

JEE Mains 2022 MCQ

In which of the following half cells, electrochemical reaction is pH dependent?

$Pt\,|\,F{e^{3 + }},\,F{e^{2 + }}$

$MnO_4^ - \,|M{n^{2 + }}$

$Ag\,|\,AgCl\,|C{l^{ - 1}}$

${1 \over 2}{F_2}\,|{F^ - }$

Question 57: Palette 57/134

JEE Mains 2022 MCQ

In 3d series, the metal having the highest M²⁺/M standard electrode potential is :

Question 58: Palette 58/134

JEE Mains 2022 MCQ

The ${\left( {{{\partial E} \over {\partial T}}} \right)_P}$ of different types of half cells are as follows:

A	B	C	D
$1 \times {10^{ - 4}}$	$2 \times {10^{ - 4}}$	$0.1 \times {10^{ - 4}}$	$0.2 \times {10^{ - 4}}$

(Where E is the electromotive force)

Which of the above half cells would be preferred to be used as reference electrode?

Question 59: Palette 59/134

JEE Mains 2022 MCQ

The correct order of reduction potentials of the following pairs is

A. Cl₂/Cl^$-$

B. I²/I^$-$

C. Ag⁺/Ag

D. Na⁺/Na

E. Li⁺/Li

Choose the correct answer from the options given below.

A > C > B > D > E

A > B > C > D > E

A > C > B > E > D

A > B > C > E > D

Question 60: Palette 60/134

JEE Mains 2021 MCQ

Match List - I with List - II

	List - I (Parmeter)		List - II (Unit)
(a)	Cell constant	(i)	$S\,c{m^2}mo{l^{ - 1}}$
(b)	Molar conductivity	(ii)	Dimensionless
(c)	Conductivity	(iii)	${m^{ - 1}}$
(d)	Degree of dissociation of electrolyte	(iv)	${\Omega ^{ - 1}}{m^{ - 1}}$

Choose the most appropriate answer from the options given below :

(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

Question 61: Palette 61/134

JEE Mains 2021 MCQ

Given below are two statements :

Statement I : The limiting molar conductivity of KCl (strong electrolyte) is higher compared to that of CH₃COOH (weak electrolyte).

Statement II : Molar conductivity decreases with decrease in concentration of electrolyte.

In the light of the above statements, choose the most appropriate answer from the options given below :

Statement I is true but Statement II is false.

Statement I is false but Statement II is true.

Both Statement I and Statement II are true.

Both Statement I and Statement II are false.

Question 62: Palette 62/134

JEE Mains 2021 MCQ

Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is :

PbO

PbO₂

PbSO₄

Pb₃O₄

Question 63: Palette 63/134

JEE Mains 2021 MCQ

The electrode potential of M²⁺/M of 3d-series elements shows positive value for :

Question 65: Palette 65/134

JEE Mains 2020 MCQ

The variation of molar conductivity with concentration of an electrolyte (X) in aqueous solution is shown in the given figure. JEE Main 2020 (Online) 5th September Evening Slot Chemistry - Electrochemistry Question 150 English

JEE Main 2020 (Online) 5th September Evening Slot Chemistry - Electrochemistry Question 150 English

The electrolyte X is :

HCl

CH₃COOH

NaCl

KNO₃

Question 66: Palette 66/134

JEE Mains 2020 MCQ

250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M AgNO₃ and 0.1 M AuCl. The solution was electrolyzed at 2V by passing a current of 1A for 15 minutes. The metal/metals electrodeposited will be

[ $E_{A{g^ + }/Ag}^0$ = 0.80 V, $E_{A{u^ + }/Au}^0$ = 1.69 V ]

Silver and gold in equal mass proportion

Silver and gold in proportion to their atomic weights

Only gold

Only silver

Question 67: Palette 67/134

JEE Mains 2020 MCQ

JEE Main 2020 (Online) 4th September Morning Slot Chemistry - Electrochemistry Question 153 English

$E_{C{u^{2 + }}|Cu}^0$ = +0.34 V

$E_{Z{n^{2 + }}|Zn}^0$ = -0.76 V

Identify the incorrect statement from the option below for the above cell :

If E_ext < 1.1 V, Zn dissolves at anode and Cu deposits at cathode

If E_ext = 1.1 V, no flow of e^– or current occurs

If E_ext > 1.1 V, e^– flows from Cu to Zn

If E_ext > 1.1 V, Zn dissolves at Zn electrode and Cu deposits at Cu electrode

Question 68: Palette 68/134

JEE Mains 2020 MCQ

Let C_NaCl and C_BaSO₄ be the conductances (in S) measured for saturated aqueous solutions of NaCl and BaSO₄, respectively, at a temperature T. Which of the following is false?

Ionic mobilities of ions from both salts increase with T.

C_NaCl(T₂) > C_NaCl(T₁) for T₂ > T₁

C_BaSO₄(T₂) > C_BaSO₄(T₁) for T₂ > T₁

C_NaCl >> C_BaSO₄ at a given T

Question 70: Palette 70/134

JEE Mains 2020 MCQ

Given that the standard potentials (E^o) of Cu²⁺/Cu and Cu⁺/Cu are 0.34 V and 0.522 V respectively, the E^o of Cu²⁺/Cu⁺ :

- 0.182 V

- 0.158 V

0.182 V

+0.158 V

Question 71: Palette 71/134

JEE Mains 2019 MCQ

Given

CO³⁺ + e^– $ \to $ CO₂⁺ ; E^o = + 1.81 V

Pb⁴⁺ + 2e^– $ \to $ Pb₂⁺ ; E^o = + 1.67 V

Ce⁴⁺ + e^– $ \to $ Ce³⁺ ; E^o = + 1.61 V

Bi³⁺ + 3e^– $ \to $ Bi ; E^o = + 0.20 V

Oxidizing power of the species will increase in the order :

Co³⁺ < Ce⁴⁺ < Bi³⁺ < Pb⁴⁺

Co³⁺ < Pb⁴⁺ < Ce⁴⁺ < Bi³⁺

Ce⁴⁺ < Pb⁴⁺ < Bi³⁺ < Co³⁺

Bi³⁺ < Ce⁴⁺ < Pb⁴⁺ < Co³⁺

Question 72: Palette 72/134

JEE Mains 2019 MCQ

Which one of the following graphs between molar conductivity (${\Lambda _m}$) versus $\sqrt C $ is correct ?

JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Electrochemistry Question 165 English Option 1

JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Electrochemistry Question 165 English Option 2

JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Electrochemistry Question 165 English Option 3

JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Electrochemistry Question 165 English Option 4

Question 73: Palette 73/134

JEE Mains 2019 MCQ

Consider the statements S1 and S2

S1 : Conductivity always increases with decrease in the concentration of electrolyte.

S2 : Molar conductivity always increases with decrease in the concentration of electrolyte.

The correct option among the following is :

Both S1 and S2 are wrong

S1 is correct and S2 is wrong

Both S1 and S2 are correct

S1 is wrong and S2 is correct

Question 74: Palette 74/134

JEE Mains 2019 MCQ

A solution of Ni(NO₃)₂ is electrolysed between platinum electrodes using 0.1 Faraday electricity. How many mole of Ni will be deposited at the cathode?

0.10

0.15

0.20

0.05

Question 75: Palette 75/134

JEE Mains 2019 MCQ

The standard Gibbs energy for the given cell reaction in kJ mol^–1 at 298 K is :

Zn(s) + Cu²⁺ (aq) $ \to $ Zn²⁺ (aq) + Cu (s),

E° = 2 V at 298 K

(Faraday's constant, F = 96000 C mol^–1)

384

–192

–384

192

Question 76: Palette 76/134

JEE Mains 2019 MCQ

Calculate the standard cell potential in (V) of the cell in which following reaction takes place :

Fe²⁺(aq) + Ag⁺(aq) $ \to $ Fe³⁺(aq) + Ag (s)

Given that

$E_{A{g^ + }/Ag}^o = xV$

$E_{Fe^{2+ }/Fe}^o = yV$

$E_{Fe^{3+ }/Fe}^o = zV$

x + 2y - 3z

x - z

x - y

x + y - z

Question 78: Palette 78/134

JEE Mains 2019 MCQ

$ \wedge _m^ \circ $ for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm² mol^–1, respectively. If the conductivity of 0.001 M HA is-

5 $ \times $ 10^–5 S cm^–1, degree of dissociation of HA is -

0.50

0.125

0.25

0.75

Question 81: Palette 81/134

JEE Mains 2019 MCQ

For the cell Zn(s) |Zn²⁺ (aq)| |M^x+ (aq)| M(s), different half cells and their standard electrode potentials are given below :

M^x+ (aq)/M(s)	Au³⁺(aq)/Au(s)	Ag⁺(aq)/Ag(s)	Fe³⁺(aq)/Fe²⁺ (aq)	Fe²⁺(aq)/Fe(s)
E⁰_M^x+_/M/(V)	1.40	0.80	0.77	$-$0.44

If $E_{z{n^{2 + }}/zn}^0$ = $-$ 0.76 V, which cathode will give maximum value of E^o_cell per electron transferred?

Ag⁺/Ag

Fe³⁺/Fe²⁺

Au³⁺/Au

Fe²⁺/Fe

Question 83: Palette 83/134

JEE Mains 2019 MCQ

Consider the following reduction processes :
Zn²⁺ + 2e^– $ \to $ Zn(s) ; E^o = – 0.76 V
Ca²⁺ + 2e^– $ \to $ Ca(s); E^o = –2.87 V
Mg²⁺ + 2e^– $ \to $ Mg(s) ; E^o = – 2.36 V
Ni² + 2e^– $ \to $ Ni(s) ; E^o = – 0.25
The reducing power of the metals increases in the order :

Ca < Mg < Zn < Ni

Ni < Zn < Mg < Ca

Zn < Mg < Ni < Ca

Ca < Zn < Mg < Ni

Question 84: Palette 84/134

JEE Mains 2019 MCQ

If the standard electrode potential for a cell is 2 V at 300 K, the equilibrium constant (K) for the reaction

Zn(s) + Cu²⁺ (aq) $\rightleftharpoons$ Zn²⁺(aq) + Cu(s)

at 300 K is approximately,

(R = 8 JK^$-$1mol^$-$1, F = 96000 C mol^$-$1)

e^$-$80

e^$-$160

e³²⁰

e¹⁶⁰

Question 85: Palette 85/134

JEE Mains 2019 MCQ

The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of PbSO₄ electrolyzed in g during the process is : (Molar mass of PbSO₄ = 303 g mol^$-$1)

22.8

15.2

7.6

11.4

Question 86: Palette 86/134

JEE Mains 2018 MCQ

When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produced is :

9.81 g

10.9 g

98.1 g

109.0 g

Question 87: Palette 87/134

JEE Mains 2018 MCQ

How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane?
(Atomic weight of B = 10.8 u)

1.6 hours

6.4 hours

0.8 hours

3.2 hours

Question 88: Palette 88/134

JEE Mains 2018 MCQ

When an electric currents passed through acidified water, 112 mL of hydrogen gas at N.T.P. was collected at the cathode in 965 seconds. The current passed, in ampere, is :

1.0

0.5

0.1

2.0

Question 89: Palette 89/134

JEE Mains 2017 MCQ

To find the standard potential of M³⁺/M electrode,the following cell is constituted : Pt/M/M³⁺(0.001 mol L⁻¹ )/Ag⁺(0.01 mol L⁻¹ )/Ag

The emf of the cell is found to be 0.421 volt at 298 K. The standard potential of half reaction M3⁺ + 3e⁻$ \to $ M at 298 K will be :

(Given $E_{A{g^ + }\,/\,Ag}^ - $ at 298 K = 0.80 Volt)

0.38 Volt

0.32 Volt

1.28 Volt

0.66 Volt

Question 90: Palette 90/134

JEE Mains 2017 MCQ

Consider the following standard electrode potentials (E^o in volts) in aqueous solution :

Element	M³⁺ /M	M⁺ /M
A1	-1.66	+ 0.55
T1	+1.26	- 0.34

Based on these data, which of the following statements is correct ?

T1⁺ is more stable than A1³⁺

A1⁺ is more stable than A1³⁺

T1 ⁺ is more stable than A1⁺

T1³⁺ is more stable than A1³⁺

Question 91: Palette 91/134

JEE Mains 2017 MCQ

What is the standard reduction potential (E^o) for Fe³⁺ $ \to $ Fe ?
Given that :
Fe²⁺ + 2e^$-$ $ \to $ Fe; $E_{F{e^{2 + }}/Fe}^o$ = $-$0.47 V
Fe³⁺ + e^$-$ $ \to $ Fe²⁺; $E_{F{e^{3 + }}/F{e^{2 + }}}^o$ = +0.77 V

$-$ 0.057 V

+ 0.057 V

+ 0.30 V

$-$ 0.30 V

Question 92: Palette 92/134

JEE Mains 2017 MCQ

Given
$E_{C{l_2}/C{l^ - }}^o$ = 1.36 V, $E_{C{r^{3 + }}/Cr}^o$ = - 0.74 V
$E_{C{r_2}{O_7}^{2 - }/C{r^{3 + }}}^o$ = 1.33 V, $E_{Mn{O_4}^ - /Mn ^{2+}}^o$ = 1.51 V
Among the following, the strongest reducing agent is :

Mn²⁺

Cr³⁺

Cl^–

Question 93: Palette 93/134

JEE Mains 2016 MCQ

Identify the correct statement :

Iron corrodes in oxygen-free water.

Iron corrodes more rapidly in salt water because its electrochemical potential is higher.

Corrosion of iron can be minimized by forming a contact with another metal with a higher reduction potential.

Corrosion of iron can be minimized by forming an impermeable barrier at its surface.

Question 94: Palette 94/134

JEE Mains 2016 MCQ

Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing 0.2 Faraday electricity through an aqueous solution of potassium succinate, the total volume of gases (at both cathode and anode) at STP (1 atm and 273 K) is :

2.24 L

4.48 L

6.72 L

8.96 L

Question 95: Palette 95/134

JEE Mains 2016 MCQ

What will occur if a block of copper metal is dropped into a beaker containing a solution of 1M ZnSO₄?

The copper metal will dissolve and zinc metal will be deposited.

The copper metal will dissolve with evolution of hydrogen gas.

The copper metal will dissolve with evolution of oxygen gas.

No reaction will occur.

Question 96: Palette 96/134

JEE Mains 2016 MCQ

Galvanization is applying a coating of :

Question 97: Palette 97/134

JEE Mains 2015 MCQ

Two Faraday of electricity is passed through a solution of CuSO₄. The mass of copper deposited at the cathode is: (at. mass of Cu = 63.5 amu)

63.5 g

2 g

127 g

0 g

Question 98: Palette 98/134

JEE Mains 2014 MCQ

The equivalent conductance of NaCl at concentration C and at infinite dilution are ${\lambda _C}$ and ${\lambda _\infty }$, respectively. The correct relationship between ${\lambda _C}$ and ${\lambda _\infty }$ is given as: (where the constant B is positive)

${\lambda _C} = {\lambda _\infty } + (B)C$

${\lambda _C} = {\lambda _\infty } - (B)C$

${\lambda _C} = {\lambda _\infty } - (B)\sqrt C$

${\lambda _C} = {\lambda _\infty } + (B)\sqrt C$

Question 99: Palette 99/134

JEE Mains 2014 MCQ

Resistance of 0.2 M solution of an electrolyte is 50 $\Omega$. The specific conductance of the solution is 1.4 S m^-1. The resistance of 0.5 M solution of the same electrolyte is 280 $\Omega$. The molar conductivity of 0.5 M solution of the electrolyte in S m² mol^-1 is :

5 × 10³

5 × 10²

5 × 10^-4

5 × 10^-3

Question 100: Palette 100/134

JEE Mains 2014 MCQ

Given below are the half-cell reactions:

Mn²⁺ + 2e^- $\to$ Mn; E^o = -1.18 V

2(Mn³⁺ + e^- $\to$ Mn²⁺); E^o = +1.51 V

The E^o for 3Mn²⁺ $\to$ Mn + 2Mn³⁺ will be :

– 0.33 V; the reaction will not occur

– 0.33 V; the reaction will occur

– 2.69 V; the reaction will not occur

– 2.69 V; the reaction will occur

Question 101: Palette 101/134

JEE Mains 2013 MCQ

Given

$E_{C{r^{2 + }}/Cr}^o$ = -0.74 V; $E_{MnO_4^ - /M{n^{2 + }}}^o$ = 1.51 V

$E_{C{r_2}O_7^{2 - }/C{r^{3 + }}}^o$ = 1.33 V; $E_{Cl/C{l^ - }}^o$ = 1.36 V

Based on the data given above, strongest oxidising agent will be :

Cr³⁺

Mn²⁺

$MnO_4^ - $

Cl^-

Question 102: Palette 102/134

JEE Mains 2012 MCQ

The standard reduction potentials for Zn²⁺/ Zn, Ni²⁺/ Ni, and Fe²⁺/ Fe are –0.76, –0.23 and –0.44 V respectively. The reaction

X + Y²⁺ $\to$ X²⁺ + Y will be spontaneous when :

X = Ni, Y = Fe

X = Ni, Y = Zn

X = Fe, Y = Zn

X = Zn, Y = Ni

Question 103: Palette 103/134

JEE Mains 2011 MCQ

The reduction potential of hydrogen half cell will be negative if :

p(H₂) = 1 atm and [H⁺] = 1.0 M

p(H₂) = 1 atm and [H⁺] = 2.0 M

p(H₂) = 2 atm and [H⁺] =1.0 M

p(H₂) = 2 atm and [H⁺] =2.0 M

Question 105: Palette 105/134

JEE Mains 2010 MCQ

The Gibbs energy for the decomposition of Al₂O₃ at 500^oC is as follows :

${2 \over 3}A{l_2}{O_3}$ $\to$ ${4 \over 3}Al + {O_2}$, ${\Delta _r}G$ = + 966 kJ mol^–1

The potential difference needed for electrolytic reduction of Al₂O₃ at 500^oC is at least :

4.5 V

3.0 V

2.5 V

5.0 V

Question 106: Palette 106/134

JEE Mains 2009 MCQ

Given : $E_{F{e^{3 + }}/Fe}^o$ = -0.036V; $E_{F{e^{2 + }}/Fe}^o$ = -0.439 V
The value of standard electrode potential for the change,
Fe³⁺ (aq) + e^- $\to$ Fe²⁺ (aq) will be

-0.072 V

0.385 V

0.770 V

0.270

Question 107: Palette 107/134

JEE Mains 2009 MCQ

In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is
CH₃OH(l) + 3/2O₂ $\to$ CO₂ (g) + 2H₂O (l)
At 298K standard Gibb’s energies of formation for CH₃OH(l), H₂O(l) and CO₂ (g) are -166.2, -237.2 and -394.4 kJ mol⁻¹ respectively. If standard enthalpy of combustion of methanol is -726 kJ mol⁻¹, efficiency of the fuel cell will be

87%

90%

97%

80%

Question 108: Palette 108/134

JEE Mains 2008 MCQ

Given $E_{C{r^{3 + }}/Cr}^o$ = -0.72 V; $E_{Fe^{2+}/Fe}^o$ = -0.42V, The potential for the cell Cr | Cr³⁺ (0.1M) || Fe²⁺ (0.01 M) | Fe is

0.26 V

0.399 V

−0.339 V

−0.26 V

Question 112: Palette 112/134

JEE Mains 2006 MCQ

Given the data at 25^oC,
Ag + I^- $\to$ AgI + e^- , E^o = 0.152 V
Ag $\to$ Ag⁺ + e^-, E^o = -0.800 V
What is the value of log K_sp for AgI? (2.303 RT/F = 0.059 V)

–8.12

+8.612

–37.83

–16.13

Question 113: Palette 113/134

JEE Mains 2006 MCQ

Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100$\Omega $. The conductivity of this solution is 1.29 S m^–1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 $\Omega $, The molar conductivity of 0.02 M solution of the electrolyte will be

124 $\times$ 10^–4 S m² mol^–1

1240 $\times$ 10^–4 S m² mol^–1

1.24 $\times$ 10^–4 S m² mol^–1

12.4 $\times$ 10^–4 S m² mol^–1

Question 114: Palette 114/134

JEE Mains 2005 MCQ

The highest electrical conductivity of the following aqueous solutions is of :

0.1 M acetic acid

0.1 M chloroacetic acid

0.1 M fluoroacetic acid

0.1 M difluoroacetic acid

Question 115: Palette 115/134

JEE Mains 2005 MCQ

Electrolyte:	KCl	KNO₃	HCl	NaOAc	NaCl
${ \wedge ^\infty }(Sc{m^2}mo{l^{ - 1}}):$	149.9	145	426.2	91	126.5

Calculate $ \wedge _{HOAc}^\infty $ Using appropriate molar conductances of the electrolytes listed above at infinite dilution in H₂O at 25^oC

517.2

552.7

390.7

217.5

Question 116: Palette 116/134

JEE Mains 2005 MCQ

For a spontaneous reaction the ∆G , equilibrium constant (K) and $E_{cell}^o$ will be respectively

-ve, >1, +ve

+ve, >1, -ve

-ve, <1, -ve

-ve, >1, -ve

Question 117: Palette 117/134

JEE Mains 2005 MCQ

Aluminium oxide may be electrolysed at 1000^oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al³⁺ + 3e^- $\to$ Al^o To prepare 5.12 kg of aluminium metal by this method would require

5.49 $\times$ 10⁷ C of electricity

1.83 $\times$ 10⁷ C of electricity

5.49 $\times$ 10⁴ C of electricity

5.49 $\times$ 10¹ C of electricity

Question 118: Palette 118/134

JEE Mains 2004 MCQ

The standard e.m.f of a cell, involving one electron change is found to be 0.591 V at 25^oC. The equilibrium constant of the reaction is (F = 96,500 C mol^-1: R = 8.314 JK^-1 mol^-1)

1.0 $\times$ 10¹

1.0 $\times$ 10³⁰

1.0 $\times$ 10¹⁰

1.0 $\times$ 10⁵

Question 119: Palette 119/134

JEE Mains 2004 MCQ

Consider the following E^o values

$E_{F{e^{3 + }}/F{e^{2 + }}}^o$ = 0.77 V;

$E_{S{n^{2 + }}/S{n}}^o$ = -0.14 V

Under standard conditions the potential for the reaction

Sn(s) + 2Fe³⁺(aq) $\to$ 2Fe²⁺(aq) + Sn²⁺(aq) is :

1.68 V

0.63 V

0.91 V

1.40 V

Question 120: Palette 120/134

JEE Mains 2004 MCQ

In a cell that utilises the reaction Zn(s) + 2H⁺ (aq) $\to$ Zn2+(aq) + H2(g) addition of H₂SO₄ to cathode compartment, will

lower the E and shift equilibrium to the left

increases the E and shift equilibrium to the left

increase the E and shift equilibrium to the right

Lower the E and shift equilibrium to the right

Question 122: Palette 122/134

JEE Mains 2004 MCQ

The limiting molar conductivities Λ° for NaCl, KBr and KCl are 126, 152 and 150 S cm² mol^-1 respectively. The Λ° for NaBr is

128 S cm² mol^-1

278 S cm² mol^-1

176 S cm² mol^-1

302 S cm² mol^-1

Question 123: Palette 123/134

JEE Mains 2004 MCQ

In a hydrogen – oxygen fuel cell, combustion of hydrogen occurs to :

generate heat

remove adsorbed oxygen from electrode surfaces

produce high purity water

create potential difference between the two electrodes

Question 124: Palette 124/134

JEE Mains 2003 MCQ

For a cell reaction involving a two-electron change, the standard e.m.f. of the cell is found to be 0.295 V at 25^oC. The equilibrium constant of the reaction at 25^oC will be

29.5 $\times$ 10^-2

1 $\times$ 10¹⁰

1 $\times$ 10^-10

Question 126: Palette 126/134

JEE Mains 2003 MCQ

Several blocks of magnesium are fixed to the bottom of a ship to :

make the ship lighter

prevent action of water and salt

prevent puncturing by under-sea rocks

keep away the sharks

Question 127: Palette 127/134

JEE Mains 2003 MCQ

Standard reduction electrode potentials of three metals A,B&C are respectively +0.5 V, -3.0 V & -1.2 V. The reducing, powers of these metals are

A > B > C

C > B > A

A > C > B

B > C > A

Question 128: Palette 128/134

JEE Mains 2003 MCQ

When during electrolysis of a solution of AgNO₃, 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be :

10.8 g

21.6 g

108 g

1.08 g

Question 129: Palette 129/134

JEE Mains 2002 MCQ

Conductivity (Seimen’s S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel then, then constant of proportionality is expressed in :

Sm mol^-1

Sm² mol^-1

S^-2m² mol

S²m² mol^-2

Question 131: Palette 131/134

JEE Mains 2002 MCQ

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are :

cathode = pure zinc, anode = pure copper

cathode = impure sample, anode = pure copper

cathode = impure zinc, anode = impure sample

cathode = pure copper, anode = impure sample

Question 132: Palette 132/134

JEE Mains 2002 MCQ

Which of the following reaction is possible at anode?

2Cr³⁺ + 7H₂O $\to Cr_2O_7^{2-}$ + 14H⁺

F₂ $\to$ 2F^-

(1/2) O₂ + 2H⁺ $\to$ H₂O

none of these

Question 133: Palette 133/134

JEE Mains 2002 MCQ

EMF of a cell in terms of reduction potential of its left and right electrodes is :

E = E_left - E_right

E = E_left + E_right

E = E_right - E_left

E = -(E_right + E_left)

Question 134: Palette 134/134

JEE Mains 2002 MCQ

For a cell given below

AIEEE 2002 Chemistry - Electrochemistry Question 75 English

$ \begin{aligned} \mathrm{Ag}^{+}+\mathrm{e}^{-} & \longrightarrow \mathrm{Ag}; E^{\circ}=x \\\\ \mathrm{Cu}^{2+}+2 e^{-} & \longrightarrow \mathrm{Cu}{;} E^{\circ}=y \end{aligned} $

$ E^{\circ} \text { cell is } $ :

$x+2 y$

$2 x+y$

$y-x$

$y-2 x$

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