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Electrochemistry

226 Questions Start JEE Mains Test
All Exams JEE Mains JEE Advanced TS-EAMCET AP-EAPCET BITSAT
2007 Q201 JEE Mains MCQ
14 Mar 2026
The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 25oC are given below:
$ \wedge _{C{H_3}COONa}^o$ = 91.0 S cm2/equiv
$ \wedge _{HCl}^o$ = 426.2 S cm2/equiv
What additional information/quantity one needs to calculate $ \wedge ^o$ of an aqueous solution of acetic acid?
A.
$ \wedge ^o$ of chloroacetic acid (C/CH2COOH)
B.
$ \wedge ^o$ of NaCl
C.
$ \wedge ^o$ of CH3COOK
D.
The limiting equivalent conductance of ${H^ + }( \wedge _{{H^ + }}^o)$
2007 Q202 JEE Mains MCQ
14 Mar 2026
The cell, Zn | Zn2+ (1M) || Cu2+ (1M) | Cu($E_{cell}^o$ = 1.10V) was allowed to be completely discharged at 298 K. The relative concentration of Zn2+ to Cu2+ $\left[ {{{\left[ {Z{n^{2 + }}} \right]} \over {\left[ {C{u^{2 + }}} \right]}}} \right]$ is
A.
antilog (24.08)
B.
37.3
C.
1037.3
D.
9.65 $\times$ 104
2006 Q203 JEE Mains MCQ
14 Mar 2026
The molar conductivities $ \wedge _{NaOAc}^o$ and $ \wedge _{HCl}^o$ and at infinite dilution in water at 25oC are 91.0 and 426.2 Scm2/mol respectively. To calculate $ \wedge _{HOAc}^o$ , the additional value required is
A.
$ \wedge _{{H_2}O}^o$
B.
$ \wedge _{KCl}^o$
C.
$ \wedge _{NaOH}^o$
D.
$ \wedge _{NaCl}^o$
2006 Q204 JEE Mains MCQ
14 Mar 2026
Given the data at 25oC,
Ag + I- $\to$ AgI + e- , Eo = 0.152 V
Ag $\to$ Ag+ + e-, Eo = -0.800 V
What is the value of log Ksp for AgI? (2.303 RT/F = 0.059 V)
A.
–8.12
B.
+8.612
C.
–37.83
D.
–16.13
2006 Q205 JEE Mains MCQ
14 Mar 2026
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
A.
124 $\times$ 10–4 S m2 mol–1
B.
1240 $\times$ 10–4 S m2 mol–1
C.
1.24 $\times$ 10–4 S m2 mol–1
D.
12.4 $\times$ 10–4 S m2 mol–1
2005 Q206 JEE Mains MCQ
14 Mar 2026
The highest electrical conductivity of the following aqueous solutions is of :
A.
0.1 M acetic acid
B.
0.1 M chloroacetic acid
C.
0.1 M fluoroacetic acid
D.
0.1 M difluoroacetic acid
2005 Q207 JEE Mains MCQ
14 Mar 2026
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 25oC
A.
517.2
B.
552.7
C.
390.7
D.
217.5
2005 Q208 JEE Mains MCQ
14 Mar 2026
For a spontaneous reaction the ∆G , equilibrium constant (K) and $E_{cell}^o$ will be respectively
A.
-ve, >1, +ve
B.
+ve, >1, -ve
C.
-ve, <1, -ve
D.
-ve, >1, -ve
2005 Q209 JEE Mains MCQ
14 Mar 2026
Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al3+ + 3e- $\to$ Alo To prepare 5.12 kg of aluminium metal by this method would require
A.
5.49 $\times$ 107 C of electricity
B.
1.83 $\times$ 107 C of electricity
C.
5.49 $\times$ 104 C of electricity
D.
5.49 $\times$ 101 C of electricity
2004 Q210 JEE Mains MCQ
14 Mar 2026
The standard e.m.f of a cell, involving one electron change is found to be 0.591 V at 25oC. The equilibrium constant of the reaction is (F = 96,500 C mol-1: R = 8.314 JK-1 mol-1)
A.
1.0 $\times$ 101
B.
1.0 $\times$ 1030
C.
1.0 $\times$ 1010
D.
1.0 $\times$ 105
2004 Q211 JEE Mains MCQ
14 Mar 2026
Consider the following Eo 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 :
A.
1.68 V
B.
0.63 V
C.
0.91 V
D.
1.40 V
2004 Q212 JEE Mains MCQ
14 Mar 2026
In a cell that utilises the reaction Zn(s) + 2H+ (aq) $\to$ Zn2+(aq) + H2(g) addition of H2SO4 to cathode compartment, will
A.
lower the E and shift equilibrium to the left
B.
increases the E and shift equilibrium to the left
C.
increase the E and shift equilibrium to the right
D.
Lower the E and shift equilibrium to the right
2004 Q213 JEE Mains MCQ
14 Mar 2026
The $E_{{M^{3 + }}/{M^{2 + }}}^o$ values for Cr, Mn, Fe and Co are – 0.41, +1.57, + 0.77 and +1.97 V respectively. For which one of these metals the change in oxidation state form +2 to +3 is easiest?
A.
Fe
B.
Mn
C.
Cr
D.
Co
2004 Q214 JEE Mains MCQ
14 Mar 2026
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
A.
128 S cm2 mol-1
B.
278 S cm2 mol-1
C.
176 S cm2 mol-1
D.
302 S cm2 mol-1
2004 Q215 JEE Mains MCQ
14 Mar 2026
In a hydrogen – oxygen fuel cell, combustion of hydrogen occurs to :
A.
generate heat
B.
remove adsorbed oxygen from electrode surfaces
C.
produce high purity water
D.
create potential difference between the two electrodes
2003 Q216 JEE Mains MCQ
14 Mar 2026
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 25oC. The equilibrium constant of the reaction at 25oC will be
A.
29.5 $\times$ 10-2
B.
10
C.
1 $\times$ 1010
D.
1 $\times$ 10-10
2003 Q217 JEE Mains MCQ
14 Mar 2026
For the redox reaction Zn(s) + Cu2+(0.1 M) $\to$ Zn2+(1M) + Cu(s) taking place in a cell, $E_{cell}^o$ is 1.10 volt. Ecell for the cell will be ($2.303{{RT} \over F}$ = 0.0591)
A.
1.80 volt
B.
1.07 volt
C.
0.82 volt
D.
2.14 volt
2003 Q218 JEE Mains MCQ
14 Mar 2026
Several blocks of magnesium are fixed to the bottom of a ship to :
A.
make the ship lighter
B.
prevent action of water and salt
C.
prevent puncturing by under-sea rocks
D.
keep away the sharks
2003 Q219 JEE Mains MCQ
14 Mar 2026
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.
A > B > C
B.
C > B > A
C.
A > C > B
D.
B > C > A
2003 Q220 JEE Mains MCQ
14 Mar 2026
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 :
A.
10.8 g
B.
21.6 g
C.
108 g
D.
1.08 g
2002 Q221 JEE Mains MCQ
14 Mar 2026
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 :
A.
Sm mol-1
B.
Sm2 mol-1
C.
S-2m2 mol
D.
S2m2 mol-2
2002 Q222 JEE Mains MCQ
14 Mar 2026
For the following cell with hydrogen electrodes at two different pressure p1 and p2. What will be the emf for the given cell :

$\eqalign{ & Pt({H_2})|{H^ + }(aq)|Pt({H_2}) \cr & \,\,\,\,\,{p_1}\,\,\,\,\,\,\,\,\,\,\,\,\,\,1M\,\,\,\,\,\,\,\,\,\,\,\,{p_2} \cr} $
A.
${{RT} \over F}{\log _e}{{{P_1}} \over {{P_2}}}$
B.
${{RT} \over 2F}{\log _e}{{{P_1}} \over {{P_2}}}$
C.
${{RT} \over F}{\log _e}{{{P_2}} \over {{P_1}}}$
D.
none of these
2002 Q223 JEE Mains MCQ
14 Mar 2026
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are :
A.
cathode = pure zinc, anode = pure copper
B.
cathode = impure sample, anode = pure copper
C.
cathode = impure zinc, anode = impure sample
D.
cathode = pure copper, anode = impure sample
2002 Q224 JEE Mains MCQ
14 Mar 2026
Which of the following reaction is possible at anode?
A.
2Cr3+ + 7H2O $\to Cr_2O_7^{2-}$ + 14H+
B.
F2 $\to$ 2F-
C.
(1/2) O2 + 2H+ $\to$ H2O
D.
none of these
2002 Q225 JEE Mains MCQ
14 Mar 2026
EMF of a cell in terms of reduction potential of its left and right electrodes is :
A.
E = Eleft - Eright
B.
E = Eleft + Eright
C.
E = Eright - Eleft
D.
E = -(Eright + Eleft)
2002 Q226 JEE Mains MCQ
14 Mar 2026
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 } $ :
A.
$x+2 y$
B.
$2 x+y$
C.
$y-x$
D.
$y-2 x$