Question 1: Palette 1/73

NEET 2026 MCQ

A solution of copper sulphate is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at cathode is :

(Given : Molar mass of $\mathrm{Cu}=63 \mathrm{~g} \mathrm{~mol}^{-1}$;

$ \left.1 \mathrm{~F}=96487 \mathrm{C} \mathrm{~mol}^{-1}\right) $

A

1.7018 g

B

0.2938 g

C

2.4036 g

D

0.5876 g

Question 2: Palette 2/73

NEET 2026 MCQ

Calculate emf of the half cell given below :

$ \begin{aligned} & \mathrm{Pt}(\mathrm{~s})\left|\mathrm{H}_2(\mathrm{~g}, 2 \mathrm{~atm})\right| \mathrm{HCl}(\mathrm{aq}, 0.02 \mathrm{M}) \\ & \mathrm{E}_{\mathrm{H}_2 / \mathrm{H}^{+}}^{\circ}=0 \mathrm{~V} \end{aligned} $

(Given: $\frac{2.303 R T}{F}=0.059, \log 2=0.3010$ )

A

-0.109 V

B

0.035 V

C

-0.035 V

D

0.109 V

Question 3: Palette 3/73

NEET 2026 MCQ

The standard electrode potential ( $\mathrm{E}^{\circ}$ ) for the half-cell reaction $\mathrm{Fe}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{Fe}^{2+}$ at 298 K is (Given : $\mathrm{E}^{\circ}\left(\mathrm{Fe}^{3+} / \mathrm{Fe}\right)=-0.04 \mathrm{~V}$ and $\mathrm{E}^{\circ}\left(\mathrm{Fe}^{2+} / \mathrm{Fe}\right)=-0.44 \mathrm{~V}$ at 298 K )

A

+0.92 V

B

+0.40 V

C

+0.76 V

D

-0.48 V

Question 4: Palette 4/73

NEET 2026 MCQ

For a salt XY, which is a strong electrolyte, the plot of $\Lambda_{\mathrm{m}}$ versus $\sqrt{\mathrm{c}}$ has a slope of $-90.0 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-3 / 2} \mathrm{L}^{1 / 2}$ at 298 K . At 0.01 M concentration of $\mathbf{X Y}$, the value of $\Lambda_{\mathrm{m}}$ is $145.0 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$. The limiting molar conductivity of $\mathbf{Y}^{-}$ion $\left(\lambda_{\mathbf{Y}^{-}}^0\right.$, in $\left.\mathrm{S} \mathrm{cm}^2 \mathrm{~mol}^{-1}\right)$ at 298 K will be

(Given : $\lambda_{\mathrm{X}^{+}}^0=74.0 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$ )

A

76.0

B

80.0

C

100.0

D

90.0

Question 5: Palette 5/73

NEET 2024 MCQ

From the following select the one which is not an example of corrosion.

A

Rusting of iron object

B

Production of hydrogen by electrolysis of water

C

Tarnishing of silver

D

Development of green coating on copper and bronze ornaments

Question 6: Palette 6/73

NEET 2024 MCQ

The standard cell potential of the following cell $\mathrm{Zn}\left|\mathrm{Zn}^{2+}(\mathrm{aq})\right| \mathrm{Fe}^{2+}(\mathrm{aq}) \mid \mathrm{Fe}$ is $0.32 \mathrm{~V}$. Calculate the standard Gibbs energy change for the reaction:

$\mathrm{Zn}(\mathrm{s})+\mathrm{Fe}^{2+}(\mathrm{aq}) \rightarrow \mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s})$

(Given : $1 \mathrm{~F}=96487 \mathrm{C}$)

A

$-61.75 \mathrm{~kJ} \mathrm{~mol}^{-1}$

B

$+5.006 \mathrm{~kJ} \mathrm{~mol}^{-1}$

C

$-5.006 \mathrm{~kJ} \mathrm{~mol}^{-1}$

D

$+61.75 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Question 7: Palette 7/73

NEET 2024 MCQ

Match List I with List II.

	List I (Conversion)		List II (Number of Faraday required)
A.	1 mole of H$_2$O to O$_2$	I.	3F
B.	1 mol of MnO$_4^-$ to Mn$^{2+}$	II.	2F
C.	1.5 mol of Ca from molten CaCl$_2$	III.	1F
D.	1 mol of FeO to Fe$_2$O$_3$	IV.	5F

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

Question 8: Palette 8/73

NEET 2024 MCQ

Mass in grams of copper deposited by passing 9.6487 A current through a voltmeter containing copper sulphate solution for 100 seconds is (Given : Molar mass of $\mathrm{Cu}: 63 \mathrm{~g} \mathrm{~mol}^{-1}, 1 \mathrm{~F}=96487 \mathrm{C}$)

A

3.15 g

B

0.315 g

C

31.5 g

D

0.0315 g

Question 9: Palette 9/73

NEET 2023 MCQ

The $\mathrm{E}^{\Theta}$ values for

$\begin{aligned} & \mathrm{Al}^{+} / \mathrm{Al}=+0.55 \mathrm{~V} \text { and } \mathrm{Tl}^{+} / \mathrm{Tl}=-0.34 \mathrm{~V} \\ & \mathrm{Al}^{3+} / \mathrm{Al}=-1.66 \mathrm{~V} \text { and } \mathrm{T}^{3+} / \mathrm{Tl}=+1.26 \mathrm{~V} \end{aligned}$

Identify the incorrect statement

A

$\mathrm{Al}$ is more electropositive than $\mathrm{Tl}$

B

$\mathrm{Tl}^{3+}$ is a good reducing agent than $\mathrm{Tl}^{1+}$

C

$\mathrm{Al}^{+}$ is unstable in solution

D

$\mathrm{Tl}$ can be easily oxidised to $\mathrm{Tl}^{+}$ than $\mathrm{Tl}^{3+}$

Question 10: Palette 10/73

NEET 2023 MCQ

Molar conductance of an electrolyte increase with dilution according to the equation:

$\Lambda_{\mathrm{m}}=\Lambda_{\mathrm{m}}^{\circ}-\mathrm{A} \sqrt{\mathrm{c}}$

Which of the following statements are true?

(A) This equation applies to both strong and weak electrolytes.

(B) Value of the constant $\mathrm{A}$ depends upon the nature of the solvent.

(C) Value of constant $\mathrm{A}$ is same for both $\mathrm{BaCl}_2$ and $\mathrm{MgSO}_4$

(D) Value of constant $\mathrm{A}$ is same for both $\mathrm{BaCl}_2$ and $\mathrm{Mg}(\mathrm{OH})_2$

Choose the most appropriate answer from the options given below:

A

(A) and (B) only

B

(A), (B) and (C) only

C

(B) and (C) only

D

(B) and (D) only

Question 11: Palette 11/73

NEET 2023 MCQ

The correct value of cell potential in volt for the reaction that occurs when the following two half cells are connected, is

$\begin{aligned} & \mathrm{Fe}_{(\mathrm{aq})}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Fe}(\mathrm{s}), \mathrm{E}^{\circ}=-0.44 \mathrm{~V} \\ & \mathrm{Cr}_2 \mathrm{O}_7^{2-} \text { (aq) }+14 \mathrm{H}^{+}+6 e^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O} \\ & \mathrm{E}^{\circ}=+1.33 \mathrm{~V} \end{aligned}$

A

$+1.77 \mathrm{~V}$

B

$+2.65 \mathrm{~V}$

C

$+0.01 \mathrm{~V}$

D

$+0.89 \mathrm{~V}$

Question 12: Palette 12/73

NEET 2023 MCQ

The conductivity of centimolar solution of $\mathrm{KCl}$ at $25^{\circ} \mathrm{C}$ is $0.0210 ~\mathrm{ohm}^{-1} \mathrm{~cm}^{-1}$ and the resistance of the cell containing the solution at $25^{\circ} \mathrm{C}$ is $60 ~\mathrm{ohm}$. The value of cell constant is -

A

$3.28 \mathrm{~cm}^{-1}$

B

$1.26 \mathrm{~cm}^{-1}$

C

$3.34 \mathrm{~cm}^{-1}$

D

$1.34 \mathrm{~cm}^{-1}$

Question 13: Palette 13/73

NEET 2023 MCQ

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

Assertion A : In equation $\mathrm{\Delta_rG=-nFE_{cell}}$, value of $\mathrm{\Delta_rG}$ depends on n.

Reason R : $\mathrm{E_{cell}}$ is an intensive property and $\mathrm{\Delta_rG}$ is an extensive property.

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

A

Both A and R are true but R is NOT the correct explanation of A.

B

A is true but R is false.

C

A is false but R is true.

D

Both A and R are true and R is the correct explanation of A.

Question 14: Palette 14/73

NEET 2022 MCQ

Two half cell reactions are given below.

$C{o^{3 + }} + {e^ - } \to C{o^{2 + }},\,\,\,\,\,\,\,\,\,E_{C{o^{2 + }}/C{o^{3 + }}}^0 = - 1.81\,V$

$2A{l^{3 + }} + 6{e^ - } \to 2Al(s),\,\,\,E_{Al/A{l^{3 + }}}^0 = + 1.66\,V$

The standard EMF of a cell with feasible redox reaction will be :

A

$-$3.47 V

B

+7.09 V

C

+0.15 V

D

+3.47 V

Question 15: Palette 15/73

NEET 2022 MCQ

Standard electrode potential for the cell with cell reaction

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

is 1.1 V. Calculate the standard Gibbs energy change for the cell reaction. (Given F = 96487 C mol^$-$1)

A

$-$200.27 J mol^$-$1

B

$-$200.27 kJ mol^$-$1

C

$-$212.27 kJ mol^$-$1

D

$-$212.27 J mol^$-$1

Question 16: Palette 16/73

NEET 2022 MCQ

At 298 K, the standard electrode potentials of Cu²⁺ / Cu, Zn²⁺ / Zn, Fe²⁺ / Fe and Ag⁺ / Ag are 0.34 V, $-$0.76 V, $-$0.44 V V and 0.80 V, respectively.

On the basis of standard electrode potential, predict which of the following reaction cannot occur?

A

CuSO₄(aq) + Zn(s) $\to$ ZnSO₄(aq) + Cu(s)

B

CuSO₄(aq) + Fe(s) $\to$ FeSO₄(aq) + Cu(s)

C

FeSO₄(aq) + Zn(s) $\to$ ZnSO₄(aq) + Fe(s)

D

2CuSO₄(aq) + 2Ag(s) $\to$ 2Cu(s) + Ag₂SO₄(aq)

Question 17: Palette 17/73

NEET 2022 MCQ

Given below are half cell reactions:

$MnO_4^ - + 8{H^ + } + 5{e^ - } \to M{n^{2 + }} + 4{H_2}O$,

$E_{M{n^{2 + }}/MnO_4^ - }^o = - 1.510\,V$

${1 \over 2}{O_2} + 2{H^ + } + 2{e^ - } \to {H_2}O$

$E_{{O_2}/{H_2}O}^o = + 1.223\,V$

Will the permanganate ion, $MnO_4^ - $ liberate O₂ from water in the presence of an acid?

A

Yes, because $E_{cell}^o$ = + 0.287 V

B

No, because $E_{cell}^o$ = $-$0.287 V

C

Yes, because $E_{cell}^o$ = + 2.733 V

D

No, because $E_{cell}^o$ = $-$ 2.733 V

Question 18: Palette 18/73

NEET 2022 MCQ

Find the emf of the cell in which the following reaction takes place at 298 K

Ni(s) + 2Ag⁺ (0.001 M) $\to$ Ni²⁺ (0.001 M) + 2Ag(s)

(Given that E$_{cell}^o$ = 10.5 V, ${{2.303\,RT} \over F} = 0.059$ at 298 K)

A

10.4115 V

B

10.385 V

C

0.9615 V

D

10.05 V

Question 19: Palette 19/73

NEET 2021 MCQ

The molar conductance of NaCl, HCl and CH₃COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm² mol^$-$1 respectively. The molar conductance of CH₃COOH at infinite dilution is. Choose the right option for your answer.

A

540.48 S cm² mol^$-$1

B

201.28 S cm² mol^$-$1

C

390.71 S cm² mol^$-$1

D

698.28 S cm² mol^$-$1

Question 20: Palette 20/73

NEET 2021 MCQ

The molar conductivity of 0.007 M acetic acid is 20 S cm² mol^$-$1. What is the dissociation constant of acetic acid? Choose the correct option.

[$\Lambda _{{H^ + }}^o$ = 350 S cm² mol^$-$1

$\Lambda _{C{H_3}CO{O^ - }}^o$ = 50 S cm² mol^$-$1]

A

2.50 $\times$ 10^$-$5 mol L^$-$1

B

1.75 $\times$ 10^$-$4 mol L^$-$1

C

2.50 $\times$ 10^$-$4 mol L^$-$1

D

1.75 $\times$ 10^$-$5 mol L^$-$1

Question 21: Palette 21/73

NEET 2020 MCQ

On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be :

A

Oxygen gas

B

H₂S gas

C

SO₂ gas

D

Hydrogen gas

Question 22: Palette 22/73

NEET 2020 MCQ

The number of Faradays(F) required to produce 20 g of calcium from molten CaCl₂ (Atomic mass of Ca = 40 g mol^-1) is :

A

2

B

3

C

4

D

1

Question 23: Palette 23/73

NEET 2019 MCQ

For a cell involving one electron $E_{cell}^\Theta $ = 0.59 V at 298 K, the equilibrium constant for the cell reaction is :

[Given that ${{2.303RT} \over F}$ = 0.059 V at T = 298 K ]

A

1.0 $ \times $ 10³⁰

B

1.0 $ \times $ 10¹⁰

C

1.0 $ \times $ 10²

D

1.0 $ \times $ 10⁵

Question 24: Palette 24/73

NEET 2019 MCQ

For the cell reaction
2Fe³⁺(aq) + 2I^– (aq) $ \to $ 2Fe²⁺(aq) + I₂(aq)
${E_{cell}^\Theta }$ = 0.24 V at 298 K. The standard Gibbs energy ($\Delta $_rG^o) of the cell reaction is :
[Given that Faraday constant F = 96500 C mol^–1]

A

46.32 kJ mol^–1

B

23.16 kJ mol^–1

C

–46.32 kJ mol^–1

D

–23.16 kJ mol^–1

Question 25: Palette 25/73

NEET 2018 MCQ

Consider the change in oxidation state of bromine corresponding to different emf values as shown in the given diagram :
Then the species undergoing disproportionation is :

A

BrO₄^–

B

BrO₃^–

C

Br₂

D

HBrO

Question 26: Palette 26/73

NEET 2017 MCQ

In the electrochemical cell :
$Zn\left| {ZnS{O_4}\left( {0.01\,M} \right)} \right|$$\left| {CuS{O_4}\left( {1.0M} \right)} \right|Cu,$
the emf of this Daniell cell is E₁. When the concentration of ZnSO₄ is changed to 1.0 M and that of CuSO4 changed to 0.01 M, the emf changes to E₂. From the followings, which one is the relationship between E₁ and E₂? (Given, RT/F = 0.059)

A

E₁ < E₂

B

E₁ > E₂

C

E₂ = 0¹E₁

D

E₁ = E₂

Question 27: Palette 27/73

NEET 2016 MCQ

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is

A

55 minutes

B

110 minutes

C

220 minutes

D

330 minutes

Question 28: Palette 28/73

NEET 2016 MCQ

The molar conductivity of a 0.5 mol/dm³ solution of AgNO₃ with electrolytic conductivity of 5.76 $ \times $ 10^$-$3 S cm^$-$1 at 298 K is

A

2.88 S cm²/mol

B

11.52 S cm²/mol

C

0.086 S cm²/mol

D

28.8 S cm²/mol

Question 29: Palette 29/73

NEET 2016 MCQ

If the E^o_cell for a given reaction has a negative value, which of the following gives the correct relationships for the values of $\Delta $G^o and K_eq ?

A

$\Delta $G^o > 0;   K_eq < 1

B

$\Delta $G^o > 0;   K_eq > 1

C

$\Delta $G^o < 0;   K_eq > 1

D

$\Delta $G^o < 0;   K_eq < 1

Question 30: Palette 30/73

NEET 2016 MCQ

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

A

zinc is lighter than iron

B

zinc has lower melting point than iron

C

zinc has lower negative electrode potential than iron

D

zinc has higher negative electrode potential than iron

Question 31: Palette 31/73

NEET 2016 MCQ

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 $ \times $ 10^$-$19C)

A

6 $ \times $ 10²³

B

6 $ \times $ 10²⁰

C

3.75 $ \times $ 10²⁰

D

7.48 $ \times $ 10²³

Question 32: Palette 32/73

NEET 2016 MCQ

The pressure of H₂ required to make the potential of H₂-electrode zero in pure water at 298 K is

A

10^$-$10 atm

B

10^$-$4 atm

C

10^$-$14 atm

D

10^$-$12 atm

Question 33: Palette 33/73

NEET 2015 MCQ

Aqueous solution of which of the following compounds is the best conductor of electric current ?

A

Hydrochloric acid, HCl

B

Ammonia, NH₃

C

Fructose, C₆H₁₂O₆

D

Acetic acid, C₂H₄O₂

Question 34: Palette 34/73

NEET 2015 MCQ

A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as

A

dynamo

B

Ni-Cd cell

C

fuel cell

D

electrolytic cell

Question 35: Palette 35/73

NEET 2014 MCQ

When 0.1 mol MnO$_4^{2 - }$ is oxidised the quantity of electricity required to completely oxidise MnO$_4^{2 - }$ to MnO$_4^ - $ is

A

96500 C

B

2 $ \times $ 96500 C

C

9650 C

D

96.50 C

Question 36: Palette 36/73

NEET 2014 MCQ

The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O₂ at STP will be

A

5.4 g

B

10.8 g

C

54.0 g

D

108.0 g

Question 37: Palette 37/73

NEET 2013 MCQ

How many gram of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (1 Faraday = 96,500 C; Atomic mass of Co = 59 u)

A

4.0

B

20.0

C

40.0

D

0.66

Question 38: Palette 38/73

NEET 2013 MCQ

Consider the half-cell reduction reaction
Mn²⁺ + 2e^$-$ $ \to $ Mn, E^o = $-$1.18 V
Mn²⁺ $ \to $ Mn³⁺ + e^$-$, E^o = $-$ 1.51 V
The $E$^o for the reaction 3 Mn²⁺ $ \to $ Mn^o + 2Mn³⁺, and possibility of the forward reaction are respectively

A

$-$ 4.18 V and yes

B

+ 0.33 V and yes

C

+ 2.69 V and no

D

$-$ 2.69 V and no

Question 39: Palette 39/73

NEET 2013 MCQ

At 25^oC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm^$-$1 cm² mol^$-$1 and at infinite dilution its molar conductance is 238 ohm^$-$1 cm² mol^$-$1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is

A

4.008%

B

40.800%

C

2.080%

D

20.800%

Question 40: Palette 40/73

NEET 2013 MCQ

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be

A

0.118 V

B

1.18 V

C

0.059 V

D

0.59 V

Question 41: Palette 41/73

NEET 2013 MCQ

A button cell used in watches function as following.
Zn_(s) + Ag₂O_(s) + H₂O_(l) $\rightleftharpoons$ 2Ag_(s) + Zn²⁺_(aq) + 2OH^$-$_(aq)

If half cell potentials are
Zn²⁺_(aq) + 2e^$-$ $ \to $ Zn_(s);  E^o = $-$0.76 V
Ag₂O_(s) + H₂O_(l) + 2e^$-$ $ \to $ 2Ag_(s) + 2OH^$-$_(aq), E^o = 0.34 V

The cell potential will be

A

0.84 V

B

1.34 V

C

1.10 V

D

0.42 V

Question 42: Palette 42/73

NEET 2012 MCQ

Molar conductivities $\left( {\Lambda _m^o} \right)$ at infinite dilution of NaCl, Hcl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol^$-$1 respectively. $\left( {\Lambda _m^o} \right)$ for CH₃COOH will be

A

425.5 S cm² mol^$-$1

B

180.5 S cm² mol^$-$1

C

290.8 S cm² mol^$-$1

D

390.5 S cm² mol^$-$1

Question 43: Palette 43/73

NEET 2012 MCQ

Standard reduction potentials of the half reactions are given below :
F_2(g) + 2e^$-$ $ \to $ 2F^$-$_(aq) ;   E^o = + 2.85 V
Cl_2(g) + 2e^$-$ $ \to $ 2Cl^$-$_(aq) ;   E^o = + 1.36 V
Br_2(l) + 2e^$-$ $ \to $ 2Br^$-$_(aq) ;   E^o = + 1.06 V
I_2(s) + 2e^$-$ $ \to $ 2I^$-$_(aq) ;  E^o = + 0.53 V

The strongest oxidising and reducing agents 23 respectively are

A

F₂ and I^$-$

B

Br₂ and Cl^$-$

C

Cl₂ and Br^$-$

D

Cl₂ and I₂

Question 44: Palette 44/73

NEET 2012 MCQ

The Gibb's energy for the decomposition of Al₂O₃ at 500^oC is as follows
${2 \over 3}$ Al₂O₃ $ \to $ ${4 \over 3}$ Al + O₂
$\Delta $_rG = +960 kJ mol^$-$1
The potential difference needed for the electrolytic reduction of aluminium oxide (Al₂O₃) at 500^oC is at least

A

4.5 V

B

3.0 V

C

2.5 V

D

5.0 V

Question 45: Palette 45/73

NEET 2012 MCQ

Limiting molar conductivity of NH₄OH
$\left[ {} \right.$i.e.  $\Lambda _{m\left( {N{H_4}OH} \right)}^0$$\left. {} \right]$ is equal to

A

$\Lambda _{m\left( {N{H_4}OH} \right)}^0 + \Lambda _{m\left( {NaCl} \right)}^0 - \Lambda _{m\left( {NaOH} \right)}^0$

B

$\Lambda _{m\left( {NaOH} \right)}^0 + \Lambda _{m\left( {NaCl} \right)}^0 - \Lambda _{m\left( {N{H_4}Cl} \right)}^0$

C

$\Lambda _{m\left( {N{H_4}OH} \right)}^0 + \Lambda _{m\left( {N{H_4}Cl} \right)}^0 - \Lambda _{m\left( {HCl} \right)}^0$

D

$\Lambda _{m\left( {N{H_4}Cl} \right)}^0 + \Lambda _{m\left( {NaOH} \right)}^0 - \Lambda _{m\left( {NaCl} \right)}^0$

Question 46: Palette 46/73

NEET 2011 MCQ

A solution contains Fe²⁺, Fe³⁺ and I^$-$ ions. This solution was treated with iodine at 35^oC. E^o for Fe³⁺/Fe²⁺ is + 0.77 V and E^o for I₂/2I^$-$ = 0.536 V.
The favourable redox reaction is

A

I₂ will be reduced to I^$-$

B

there will be no redox reaction

C

I^$-$ will be oxidised to I₂

D

Fe²⁺ will be oxidised to Fe³⁺

Question 47: Palette 47/73

NEET 2011 MCQ

The electrode potentials for Cu²⁺_(aq) + e^$-$ $ \to $ Cu⁺_(aq)
and Cu⁺_(aq) + e^$-$ $ \to $ Cu_(s) are + 0.15 V and + 0.50 V respectively.

The value of E^o_cu²⁺/cu will be

A

0.500 V

B

0.325 V

C

0.650 V

D

0.150 V

Question 48: Palette 48/73

NEET 2011 MCQ

Standard electrode potential for Sn⁴⁺/Sn²⁺ couple is + 0.15 V and that for the Cr³⁺/Cr couple is $-$ 0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be

A

+ 1.19 V

B

+ 0.89 V

C

+ 0.18 V

D

+ 1.83 V

Question 49: Palette 49/73

NEET 2011 MCQ

Standard electrode potential of three metals X, Y and Z are $-$1.2 V, + 0.5 V and $-$ 3.0 V respectively. The reducing power of these metals will be

A

Y > Z > X

B

Y > X > Z

C

Z > X > Y

D

X > Y > Z

Question 50: Palette 50/73

NEET 2010 MCQ

Which of the following expressions correctly represents the equivalent conductance at infinite diluation of Al₂(SO₄)₃. Given that $\mathop \Lambda \limits^ \circ $_Al³⁺ and $\mathop \Lambda \limits^ \circ $_{so$_4^{2 - }$} are the equivalent conductances at infinite dilution of the respective ions?

A

$2\mathop \Lambda \limits^ \circ $_Al³⁺   +   $3\mathop \Lambda \limits^ \circ $_{so$_4^{2 - }$}

B

$\mathop \Lambda \limits^ \circ $_Al³⁺   +   $\mathop \Lambda \limits^ \circ $_{so$_4^{2 - }$}

C

($\mathop \Lambda \limits^ \circ $_Al³⁺   +   $\mathop \Lambda \limits^ \circ $_{so$_4^{2 - }$}) $ \times $ 6

D

${1 \over 3}$$\mathop \Lambda \limits^ \circ $_Al³⁺   +   ${1 \over 2}$$\mathop \Lambda \limits^ \circ $_{so$_4^{2 - }$}

Question 51: Palette 51/73

NEET 2010 MCQ

Consider the following relations for emf of an electrochemical cell
(i)   EMF of cell = (Oxidation potential of anode) $-$ (Reduction potential of cathode)
(ii)  EMF of cell = (Oxidation potential of anode) + (Reduction potential of cathode)
(iii) EMF of cell = (Reductional potential of anode) + (Reduction potential of cathode)
(iv) EMF of cell = (Oxidation potential of anode) $-$ (Oxidation potential of cathode)

Which of the above relations are correct?

A

(iii) and (i)

B

(i) and (ii)

C

(iii) and (iv)

D

(ii) and (iv)

Question 52: Palette 52/73

NEET 2010 MCQ

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to

A

increase in ionic mobility of ions

B

100% ionisation of electrolyte at normal dilution

C

increase in both i.e., number of ions and ionic mobility of ions

D

increase in number of ions.

Question 53: Palette 53/73

NEET 2010 MCQ

For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25^oC. The value of standard Gibb's energy, $\Delta $G^o will be
(F = 96500 C mol^$-$1)

A

$-$ 89.0 kJ

B

$-$ 89.0 J

C

$-$ 44.5 kJ

D

$-$ 98.0 kJ

Question 54: Palette 54/73

NEET 2009 MCQ

The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mho cm² and at infinite dilution is 400 mho cm². The dissociation constant of this acid is

A

1.25 $ \times $ 10^$-$6

B

6.25 $ \times $ 10^$-$4

C

1.25 $ \times $ 10^$-$4

D

1.25 $ \times $ 10^$-$5

Question 55: Palette 55/73

NEET 2009 MCQ

Al₂O₃ is reduced by electrolysis at low potentials and high currents. If 4.0 $ \times $ 10⁴ amperes of current is passed through molten Al₂O₃ for 6 hours, what mass of aluminium is product? (Assume 100% current efficiency, at mass of Al = 27 g mol^$-$1).

A

8.1 $ \times $ 10⁴ g

B

2.4 $ \times $ 10⁵ g

C

1.3 $ \times $ 10⁴ g

D

9.0 $ \times $ 10³ g

Question 56: Palette 56/73

NEET 2009 MCQ

Given :
(i)   Cu²⁺ + 2e^$-$ $ \to $ Cu,  E^o = 0.337 V
(ii)  Cu²⁺ + e^$-$ $ \to $ Cu⁺,  E^o = 0.153 V
Electrode potential, E^o for the reaction,
Cu⁺ + e^$-$ $ \to $ Cu,  will be

A

0.90 V

B

0.30 V

C

0.38 V

D

0.52 V

Question 57: Palette 57/73

NEET 2008 MCQ

On the basis of the following E^o values, the strongest oxidizing agent is
[Fe(CN)₆]^4$-$ $ \to $ [Fe(CN)₆]^3$-$ + e^$-$;  E^o = $-$0.35 V

Fe²⁺ $ \to $ Fe³⁺ + e^$-$;  E^o = $-$0.77 V

A

Fe³⁺

B

[Fe(CN)₆]^3$-$

C

[Fe(CN)₆]^4$-$

D

Fe²⁺

Question 58: Palette 58/73

NEET 2008 MCQ

Kohlrausch's law states that at

A

Infinite dilution, each ion makes definite contribution to conductance of an electrolyte whatever be the nature of the other ion of the electrolyte

B

Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte

C

Finite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte

D

Infinite dilution each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte.

Question 59: Palette 59/73

NEET 2008 MCQ

Standard free energies of formation (in kJ/mol) at 298 K are $-$237.2, $-$ 394.4 and $-$8.2 for H₂O_(l), CO_2(g) and pentane _(g) respectively. The value of E^o_cell for the pentane-oxygen fuel cell is

A

1.0968 V

B

0.0968 V

C

1.968 V

D

2.0968 V

Question 60: Palette 60/73

NEET 2007 MCQ

The equilibrium constant of the reaction:
Cu_(s) + 2Ag⁺_(aq) $ \to $ Cu²⁺_(aq) + 2Ag_(s);
E^o = 0.46 V at 298 K is

A

2.0 $ \times $ 10¹⁰

B

4.0 $ \times $ 10¹⁰

C

4.0 $ \times $ 10¹⁵

D

2.4 $ \times $ 10¹⁰

Question 61: Palette 61/73

NEET 2007 MCQ

The efficiency of a fuel cell is given by

A

$\Delta $G/$\Delta $S

B

$\Delta $G/$\Delta $H

C

$\Delta $S/$\Delta $G

D

$\Delta $H/$\Delta $G

Question 62: Palette 62/73

NEET 2006 MCQ

A hypothetical electrochemical cell is shown below.

$A\left| {{A^ + }\left( {xM} \right)} \right|\left| {{B^ + }\left( {yM} \right)} \right|B$

The emf measured is + 0.20 V. The cell reaction is

A

A + B⁺ $ \to $ A⁺ + B

B

A⁺ + B $ \to $ A + B⁺

C

A⁺ + e^$-$ $ \to $ A;  B⁺ + e^$-$ $ \to $ B

D

the cell reaction cannot be predicted.

Question 63: Palette 63/73

NEET 2006 MCQ

E^o_Fe²⁺/Fe = $-$ 0.441 V and E^o_{Fe³⁺/Fe²⁺} = 0.771 V, the standard EMF of the reaction Fe + 2Fe³⁺ $ \to $ 3Fe²⁺ will be

A

0.111 V

B

0.330 V

C

1.653 V

D

1.212 V

Question 64: Palette 64/73

NEET 2005 MCQ

4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al³⁺ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H ions in solution by the same quantity of electric charge will be

A

44.8 L

B

22.4 L

C

11.2 L

D

5.6 L

Question 65: Palette 65/73

NEET 2005 MCQ

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is
(Atomic mass : Al = 27)

A

270 kg

B

540 kg.

C

90 kg

D

180 kg

Question 66: Palette 66/73

NEET 2004 MCQ

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25^oC. The equilibrium constant of the reaction would be

A

2.0 $ \times $ 10¹¹

B

4.0 $ \times $ 10¹²

C

1.0 $ \times $ 10²

D

1.0 $ \times $ 10¹⁰

Question 67: Palette 67/73

NEET 2003 MCQ

The e.m.f. of a Daniell cell at 298 K is E₁.

When the concentration of ZnSO₄ is 1.0 M and that of CuSO₄ is 0.01 M, the e.m.f. changed to E₂. What is the relationship between E₁ and E₂?

A

E₁ > E₂

B

E₁ < E₂

C

E₁ = E₂

D

E₂ = 0 $ \ne $ E₁

Question 68: Palette 68/73

NEET 2003 MCQ

On the basis of the information available from the reaction,

4/3Al + O₂ $ \to $ 2/3Al₂O₃,   $\Delta $G = $-$ 827 kJ mol^$-$1 of O₂,

the minimum e.m.f. required to carry out an electrolysis of Al₂O₃ is
(F = 96500 C mol^$-$1)

A

2.14 V

B

4.28 V

C

6.42 V

D

8.56 V

Question 69: Palette 69/73

NEET 2002 MCQ

In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode while with Hg cathode it forms sodium amalgam

A

Hg is more inert than Pt

B

More voltage is required to reduce H⁺ at Hg than at Pt

C

Na is dissolved in Hg while it does not dissolve in Pt

D

Conc. of H⁺ ions is larger when Pt electrode is taken.

Question 70: Palette 70/73

NEET 2001 MCQ

Standard electrode potentials are
Fe²⁺/Fe [E^o = $-$0.44] and
Fe³⁺/Fe²⁺[ E^o = 0.77];
If Fe²⁺, Fe³⁺ and Fe blocks are kept together, then

A

Fe³⁺ increases

B

Fe³⁺ decreases

C

Fe²⁺/Fe³⁺ remains unchanged

D

Fe²⁺ decreases.

Question 71: Palette 71/73

NEET 2000 MCQ

Cell reaction is spontaneous when

A

$\Delta $G^o is negative

B

$\Delta $G^o is positive

C

$\Delta $E^o_red is positive

D

$\Delta $E^o_red is negative

Question 72: Palette 72/73

NEET 2000 MCQ

For the disproportionation of copper
2Cu⁺  $ \to $ Cu²⁺ + Cu, E^o is
(Given E^o for Cu²⁺/Cu is 0.34 V and
E^o for Cu²⁺/Cu⁺ is 0.15 V.)

A

0.49 V

B

$-$ 0.19 V

C

0.38 V

D

$-$0.38 V

Question 73: Palette 73/73

NEET 2000 MCQ

Equivalent conductances of Ba²⁺ and Cl^$-$ ions are 127 and 76 ohm^$-$1 cm^$-$1 eq^$-$1 respectively. Equivalent conductance of BaCl₂ at infinite dilution is

A

139.5

B

101.5

C

203

D

279