Electrochemistry: JEE Mains Previous Year Questions (2021-2024) | Chemistry for JEE Main & Advanced PDF Download

 Page 1


P- 1
Numerical 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. At  298 K, the standard reduction potential 
for Cu2+/Cu electrode is  0.34 V. 
 Q.1. The number of correct statements from the following is 
_______. 
(A) Conductivity always decreases with decrease in concentration
for both strong and weak electrolytes. 
(B) The number of ions per unit volume that carry current in a 
solution increases on dilution. 
(C) Molar conductivity increases with decrease in concentration 
(D) The variation in molar conductivity is different for strong and 
weak electrolytes 
(E) For weak electrolytes, the change in molar conductivity with 
dilution is due to decrease in degree of dissociation. 
 
Take  2.303RT/F=0.059 V 
The reduction potential at pH=14 for the above couple 
is   The value of x is ___________ 
 
JEE Main 2023 (Online) 13th April Evening Shift 
Page 2


P- 1
Numerical 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. At  298 K, the standard reduction potential 
for Cu2+/Cu electrode is  0.34 V. 
 Q.1. The number of correct statements from the following is 
_______. 
(A) Conductivity always decreases with decrease in concentration
for both strong and weak electrolytes. 
(B) The number of ions per unit volume that carry current in a 
solution increases on dilution. 
(C) Molar conductivity increases with decrease in concentration 
(D) The variation in molar conductivity is different for strong and 
weak electrolytes 
(E) For weak electrolytes, the change in molar conductivity with 
dilution is due to decrease in degree of dissociation. 
 
Take  2.303RT/F=0.059 V 
The reduction potential at pH=14 for the above couple 
is   The value of x is ___________ 
 
JEE Main 2023 (Online) 13th April Evening Shift 
layer of thickness  0.001 mm. A current of  2 A was passed 
through a solution of Ni(NO3)2 for 'x' seconds to coat the desired 
layer. The value of x is __________. (Nearest integer) ( pNi (density 
of Nickel) is   10 g mL, Molar mass of Nickel 
is   60 g mol
-1
    
JEE Main 2023 (Online) 13th April Morning Shift 
 
Q.4. The number of correct statements from the following is 
__________ 
A. cell Ecell  is an intensive parameter 
B. A negative E? means that the redox couple is a stronger 
reducing agent than the H+/H2 couple. 
C. The amount of electricity required for oxidation or reduction 
depends on the stoichiometry of the electrode reaction. 
D. The amount of chemical reaction which occurs at any electrode 
during electrolysis by a current is proportional to the quantity of 
electricity passed through the electrolyte. 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5. In an electrochemical reaction of lead, at standard 
temperature, if  E
0
( Pb2+/Pb)=m Volt and  E0( Pb4+/Pb)=n Volt, 
then the value of  E0( Pb2+/Pb4+) is given by m-xn. The value 
of x is ___________. (Nearest integer) 
JEE Main 2023 (Online) 11th April Morning Shift 
 
Q.6. The specific conductance of  0.0025 M acetic acid 
is   5×10
-5
 S cm
-1
 at a certain temperature. The dissociation 
constant of acetic acid is __________  × 10
-7
 (Nearest integer) 
 
Q.3. A metal surface of  100 cm2 area has to be coated with nickel 
Page 3


P- 1
Numerical 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. At  298 K, the standard reduction potential 
for Cu2+/Cu electrode is  0.34 V. 
 Q.1. The number of correct statements from the following is 
_______. 
(A) Conductivity always decreases with decrease in concentration
for both strong and weak electrolytes. 
(B) The number of ions per unit volume that carry current in a 
solution increases on dilution. 
(C) Molar conductivity increases with decrease in concentration 
(D) The variation in molar conductivity is different for strong and 
weak electrolytes 
(E) For weak electrolytes, the change in molar conductivity with 
dilution is due to decrease in degree of dissociation. 
 
Take  2.303RT/F=0.059 V 
The reduction potential at pH=14 for the above couple 
is   The value of x is ___________ 
 
JEE Main 2023 (Online) 13th April Evening Shift 
layer of thickness  0.001 mm. A current of  2 A was passed 
through a solution of Ni(NO3)2 for 'x' seconds to coat the desired 
layer. The value of x is __________. (Nearest integer) ( pNi (density 
of Nickel) is   10 g mL, Molar mass of Nickel 
is   60 g mol
-1
    
JEE Main 2023 (Online) 13th April Morning Shift 
 
Q.4. The number of correct statements from the following is 
__________ 
A. cell Ecell  is an intensive parameter 
B. A negative E? means that the redox couple is a stronger 
reducing agent than the H+/H2 couple. 
C. The amount of electricity required for oxidation or reduction 
depends on the stoichiometry of the electrode reaction. 
D. The amount of chemical reaction which occurs at any electrode 
during electrolysis by a current is proportional to the quantity of 
electricity passed through the electrolyte. 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5. In an electrochemical reaction of lead, at standard 
temperature, if  E
0
( Pb2+/Pb)=m Volt and  E0( Pb4+/Pb)=n Volt, 
then the value of  E0( Pb2+/Pb4+) is given by m-xn. The value 
of x is ___________. (Nearest integer) 
JEE Main 2023 (Online) 11th April Morning Shift 
 
Q.6. The specific conductance of  0.0025 M acetic acid 
is   5×10
-5
 S cm
-1
 at a certain temperature. The dissociation 
constant of acetic acid is __________  × 10
-7
 (Nearest integer) 
 
Q.3. A metal surface of  100 cm2 area has to be coated with nickel 
Consider limiting molar conductivity 
of  
 
JEE Main 2023 (Online) 10th April Evening Shift 
 
Q.7.  
 
JEE Main 2023 (Online) 10th April Morning Shift 
 
Q.8. The number of incorrect statements from the following is 
___________. 
A. The electrical work that a reaction can perform at constant 
pressure and temperature is equal to the reaction Gibbs energy. 
 
D. A cell is operating reversibly if the cell potential is exactly 
balanced by an opposing source of potential difference. 
 
JEE Main 2023 (Online) 8th April Evening Shift 
 
Q.9. The standard reduction potentials at    298 K for the following 
half cells are given below: 
 
Page 4


P- 1
Numerical 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. At  298 K, the standard reduction potential 
for Cu2+/Cu electrode is  0.34 V. 
 Q.1. The number of correct statements from the following is 
_______. 
(A) Conductivity always decreases with decrease in concentration
for both strong and weak electrolytes. 
(B) The number of ions per unit volume that carry current in a 
solution increases on dilution. 
(C) Molar conductivity increases with decrease in concentration 
(D) The variation in molar conductivity is different for strong and 
weak electrolytes 
(E) For weak electrolytes, the change in molar conductivity with 
dilution is due to decrease in degree of dissociation. 
 
Take  2.303RT/F=0.059 V 
The reduction potential at pH=14 for the above couple 
is   The value of x is ___________ 
 
JEE Main 2023 (Online) 13th April Evening Shift 
layer of thickness  0.001 mm. A current of  2 A was passed 
through a solution of Ni(NO3)2 for 'x' seconds to coat the desired 
layer. The value of x is __________. (Nearest integer) ( pNi (density 
of Nickel) is   10 g mL, Molar mass of Nickel 
is   60 g mol
-1
    
JEE Main 2023 (Online) 13th April Morning Shift 
 
Q.4. The number of correct statements from the following is 
__________ 
A. cell Ecell  is an intensive parameter 
B. A negative E? means that the redox couple is a stronger 
reducing agent than the H+/H2 couple. 
C. The amount of electricity required for oxidation or reduction 
depends on the stoichiometry of the electrode reaction. 
D. The amount of chemical reaction which occurs at any electrode 
during electrolysis by a current is proportional to the quantity of 
electricity passed through the electrolyte. 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5. In an electrochemical reaction of lead, at standard 
temperature, if  E
0
( Pb2+/Pb)=m Volt and  E0( Pb4+/Pb)=n Volt, 
then the value of  E0( Pb2+/Pb4+) is given by m-xn. The value 
of x is ___________. (Nearest integer) 
JEE Main 2023 (Online) 11th April Morning Shift 
 
Q.6. The specific conductance of  0.0025 M acetic acid 
is   5×10
-5
 S cm
-1
 at a certain temperature. The dissociation 
constant of acetic acid is __________  × 10
-7
 (Nearest integer) 
 
Q.3. A metal surface of  100 cm2 area has to be coated with nickel 
Consider limiting molar conductivity 
of  
 
JEE Main 2023 (Online) 10th April Evening Shift 
 
Q.7.  
 
JEE Main 2023 (Online) 10th April Morning Shift 
 
Q.8. The number of incorrect statements from the following is 
___________. 
A. The electrical work that a reaction can perform at constant 
pressure and temperature is equal to the reaction Gibbs energy. 
 
D. A cell is operating reversibly if the cell potential is exactly 
balanced by an opposing source of potential difference. 
 
JEE Main 2023 (Online) 8th April Evening Shift 
 
Q.9. The standard reduction potentials at    298 K for the following 
half cells are given below: 
 
 
The number of metal(s) which will be oxidized by NO3- in 
aqueous solution is __________. 
JEE Main 2023 (Online) 6th April Evening Shift 
 
Q.10. Consider the following pairs of solution which will be 
isotonic at the same temperature. The number of pairs of 
solutions is / are ___________. 
 
JEE Main 2023 (Online) 6th April Evening Shift 
 
Q.11.   1×10-5 M AgNO3 is added to  1 L of saturated solution 
of AgBr. The conductivity of this solution at  298 K is 
_____________   ×10-8 S m-1. 
 
 
Page 5


P- 1
Numerical 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. At  298 K, the standard reduction potential 
for Cu2+/Cu electrode is  0.34 V. 
 Q.1. The number of correct statements from the following is 
_______. 
(A) Conductivity always decreases with decrease in concentration
for both strong and weak electrolytes. 
(B) The number of ions per unit volume that carry current in a 
solution increases on dilution. 
(C) Molar conductivity increases with decrease in concentration 
(D) The variation in molar conductivity is different for strong and 
weak electrolytes 
(E) For weak electrolytes, the change in molar conductivity with 
dilution is due to decrease in degree of dissociation. 
 
Take  2.303RT/F=0.059 V 
The reduction potential at pH=14 for the above couple 
is   The value of x is ___________ 
 
JEE Main 2023 (Online) 13th April Evening Shift 
layer of thickness  0.001 mm. A current of  2 A was passed 
through a solution of Ni(NO3)2 for 'x' seconds to coat the desired 
layer. The value of x is __________. (Nearest integer) ( pNi (density 
of Nickel) is   10 g mL, Molar mass of Nickel 
is   60 g mol
-1
    
JEE Main 2023 (Online) 13th April Morning Shift 
 
Q.4. The number of correct statements from the following is 
__________ 
A. cell Ecell  is an intensive parameter 
B. A negative E? means that the redox couple is a stronger 
reducing agent than the H+/H2 couple. 
C. The amount of electricity required for oxidation or reduction 
depends on the stoichiometry of the electrode reaction. 
D. The amount of chemical reaction which occurs at any electrode 
during electrolysis by a current is proportional to the quantity of 
electricity passed through the electrolyte. 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5. In an electrochemical reaction of lead, at standard 
temperature, if  E
0
( Pb2+/Pb)=m Volt and  E0( Pb4+/Pb)=n Volt, 
then the value of  E0( Pb2+/Pb4+) is given by m-xn. The value 
of x is ___________. (Nearest integer) 
JEE Main 2023 (Online) 11th April Morning Shift 
 
Q.6. The specific conductance of  0.0025 M acetic acid 
is   5×10
-5
 S cm
-1
 at a certain temperature. The dissociation 
constant of acetic acid is __________  × 10
-7
 (Nearest integer) 
 
Q.3. A metal surface of  100 cm2 area has to be coated with nickel 
Consider limiting molar conductivity 
of  
 
JEE Main 2023 (Online) 10th April Evening Shift 
 
Q.7.  
 
JEE Main 2023 (Online) 10th April Morning Shift 
 
Q.8. The number of incorrect statements from the following is 
___________. 
A. The electrical work that a reaction can perform at constant 
pressure and temperature is equal to the reaction Gibbs energy. 
 
D. A cell is operating reversibly if the cell potential is exactly 
balanced by an opposing source of potential difference. 
 
JEE Main 2023 (Online) 8th April Evening Shift 
 
Q.9. The standard reduction potentials at    298 K for the following 
half cells are given below: 
 
 
The number of metal(s) which will be oxidized by NO3- in 
aqueous solution is __________. 
JEE Main 2023 (Online) 6th April Evening Shift 
 
Q.10. Consider the following pairs of solution which will be 
isotonic at the same temperature. The number of pairs of 
solutions is / are ___________. 
 
JEE Main 2023 (Online) 6th April Evening Shift 
 
Q.11.   1×10-5 M AgNO3 is added to  1 L of saturated solution 
of AgBr. The conductivity of this solution at  298 K is 
_____________   ×10-8 S m-1. 
 
 
JEE Main 2023 (Online) 1st February Evening Shift 
 
Q.12. At what pH, given half cell  will 
have electrode potential of 1.282 V? ___________ (Nearest Integer) 
 
JEE Main 2023 (Online) 1st February Morning Shift 
 
Q.13. The resistivity of a 0.8M solution of an electrolyte 
is  5×10-3O cm. 
 
Its molar conductivity is _________    ×104 O-1 cm2 mol
-1
. 
(Nearest integer) 
JEE Main 2023 (Online) 31st January Evening Shift 
 
Q.14. The logarithm of equilibrium constant for the 
reaction Pd
2
++4Cl-?PdCl4
2
- is ___________ (Nearest integer) 
 
JEE Main 2023 (Online) 31st January Morning Shift 
 
Q.15. The electrode potential of the following half cell at  298K