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Electrochemistry — NEET UG Chemistry PYQs

865 previous year questions from Electrochemistry with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

865 questionsChemistrySolutions on every page
1

Calculate the conductivity of 0.025 M BaCl ₂ solution if the molar conductivity of salt at 25^ C is 325 ⁻¹ cm ^2 mol ⁻¹ .

MHT CET Medical 2026 Solution View → 2

Calculate the equilibrium constant at 25 ^ C for the cell reaction, Ni(s) + Cu ²⁺(1 M ) Ni ²⁺(1 M ) + Cu(s) if E^ _ cell is 0.592 V .

MHT CET Medical 2026 Solution View → 3

Calculate the time required in second to deposit 5.85 g Ni from NiCl ₂ solution by passing 10 A current (molar mass of Ni = 58.5 g mol ⁻¹ )

MHT CET Medical 2026 Solution View → 4

Which of the following cell reactions is exhibited by fuel cell?

MHT CET Medical 2026 Solution View → 5

Which of the following types of cells is used for electroplating?

MHT CET Medical 2026 Solution View → 6

Which of the following acts as a cathode in a dry cell?

MHT CET Medical 2026 Solution View → 7

What is the Standard cell potential of a cell constituted by two electrodes, A (E^0_ A ^+/ A = 0.30 V ) and B (E^0_ B ^+/ B = +0.42 V ) ?

MHT CET Medical 2026 Solution View → 8

How long (in minutes) must a 2 A current be passed through AgNO ₃ solution to deposit 5.4 g Ag ? [Molar mass of Ag = 108 g mol ⁻¹ ]

MHT CET Medical 2026 Solution View → 9

What is the value of standard electrode potential of the standard hydrogen gas electrode?

MHT CET Medical 2026 Solution View → 10

The standard electrode potential of Zn, Ag and Cu are -0.76 , 0.80 and 0.34 volt respectively, then identify the correct statement from following.

MHT CET Medical 2026 Solution View → 11

A 0.02 M KCl solution has conductivity k=2.76 10⁻³ S cm ⁻¹ . Find molar conductivity.

MHT CET Medical 2026 Solution View → 12

The molar conductivity of 0.02 M electrolytic solution is 220 ⁻¹ cm ^2 mol ⁻¹ at 25 ^ C . Find its conductivity.

MHT CET Medical 2026 Solution View → 13

The resistivity of a solution is 25.0 ·cm. Find its conductivity in (S cm ⁻¹ ).

MHT CET Medical 2026 Solution View → 14

How many Faraday electricity is required to reduce 0.25 g of Nb(V) to the metal? ( Atomic mass of Nb = 93)

MHT CET Medical 2026 Solution View → 15

Which of the following paste is used in dry cell as an electrolyte?

MHT CET Medical 2026 Solution View → 16

What is standard decrease in Gibbs energy for the following cell? Al _ (s) Al ⁺³_ (1M) Cd ⁺²_ (1M) Cd if E^ , Al ⁺³/ Al = -1.66 V, E^ , Cd ⁺²/ Cd = -0.40 V

MHT CET Medical 2026 Solution View → 17

Dry cell is an example of

MHT CET Medical 2026 Solution View → 18

Find the mass of Zn metal deposited at the cathode during the passage of 10 amperes current through its salt solution for 10 minutes. [ Molar mass of Zn = 65.4 g mol ⁻¹ & For the r

MHT CET Medical 2026 Solution View → 19

Which of the following is a primary cell?

MHT CET Medical 2026 Solution View → 20

What is the cell constant of a cell containing a solution of resistance 90 Ohm with conductivity 2 10⁻³ Ohm ⁻¹ cm ⁻¹ ?

MHT CET Medical 2026 Solution View → 21

0.1 M solution of an electrolyte A ^+ B ^- placed in a conductivity cell with electrodes 4 cm apart and each with cross-section area equal to 2 cm ^2 was found to have a resistance

MHT CET Medical 2026 Solution View → 22

Identify the correct order of increasing reducing strength of metals from following.

MHT CET Medical 2026 Solution View → 23

Find the molar conductivity of 0.001 M AgNO ₃ solution if the conductivity of it is 1.2 10⁻⁴ ⁻¹ cm ⁻¹ .

MHT CET Medical 2026 Solution View → 24

How is the molar conductivity of an elecrolytic solution calculated?

MHT CET Medical 2026 Solution View → 25

2 MnO _ 2(s) + 2 NH ₄^+ + 2e^- Mn ₂ O _ 3(s) + 2 NH _ 3(aq) + H ₂ O _ (l) Which of the following cell exhibits above net reduction reaction?

MHT CET Medical 2026 Solution View → 26

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

MHT CET Medical 2026 Solution View → 27

Calculate the amount of electricity required to deposit 1 mole of aluminum from a solution of AlCl ₃ .

MHT CET Medical 2026 Solution View → 28

What is the number of moles of electrons gained by n mole PbO _ 2(s) when it is converted to PbSO _ 4(s) at discharging of lead accumulator?

MHT CET Medical 2026 Solution View → 29

The molar conductivity of 0.8 M BaCl ₂ solution at 25^ C is 220 ⁻¹ cm ^2 mol ⁻¹ . Calculate its conductivity.

MHT CET Medical 2026 Solution View → 30

Calculate the standard Gibbs energy change for the following cell Cd (s) | Cd ⁺⁺(1 M ) || Sn ⁺⁺(1 M )| Sn (s) if E^0_ cell is 0.27 V .

MHT CET Medical 2026 Solution View → 31

The molar conductance of NaCl, HCl and CH ₃ COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm ^2 mol ⁻¹ respectively. Calculate the molar conductance of CH ₃ COOH at infi

MHT CET Medical 2026 Solution View → 32

Which of the following elements has positive standard reduction potential?

MHT CET Medical 2026 Solution View → 33

Calculate the emf of the following cell at 25^ C Zn(s) Zn ⁺⁺(0.1 M ) Cu ⁺⁺(0.05 M ) Cu(s) if E^ cells 1.1V.

MHT CET Medical 2026 Solution View → 34

Calculate the standard Gibbs energy for the following cell reaction, A(s) + B ²⁺ (aq) A ²⁺ (aq) + B(s) , if E^ _ cell is 0.556 V .

MHT CET Medical 2026 Solution View → 35

The standard electrode potential ( E^ ) for the half-cell reaction Fe ³⁺+e^- Fe ²⁺ at 298 K is (Given: E^ ( Fe ³⁺/ Fe )=-0.04 V and E^ ( Fe ²⁺/ Fe )=-0.44 V at 298 K)

NEET 2026 Solution View → 36

For a salt XY , which is a strong electrolyte, the plot of _m versus c has a slope of -90.0 S cm ^2 mol ^ -3/2 L ^ 1/2 at 298 K. At 0.01 M concentration of XY , the value of _m is

NEET 2026 Solution View → 37

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 Cu = 63 g mol ⁻¹ ; 1

NEET 2026 Solution View → 38

Calculate emf of the half cell given below : Pt (s) | H ₂ (g, 2 atm) | HCl (aq, 0.02 M) E^ _ H ₂/ H ⁺ = 0 V ( Given : 2.303 RT F = 0.059, 2 = 0.3010 )

NEET 2026 Solution View → 39

If the molar conductivity ( _ m ) of a 0.050 ~mol ~L ⁻¹ solution of a monobasic weak acid is 90 ~S ~cm ^2 ~mol ⁻¹ , its extent (degree) of dissociation will be [Assume _ + ^ =349.6

NEET 2025 Solution View → 40

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 Cu : 63 ~g ~mol ⁻¹,

NEET 2024 Solution View → 41

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

NEET 2024 Solution View → 42

The standard cell potential of the following cell Zn | Zn ²⁺( aq ) | Fe ²⁺( aq ) Fe is 0.32 V . Calculate the standard Gibbs energy change for the reaction : Zn ( s )+ Fe ²⁺( aq )

NEET 2024 Solution View → 43

Molar conductance of an electrolyte increases with dilution according to the equation: _ m = _ m ^ - A c Which of the following statements are true? (A) This equation applies to bo

NEET 2023 Solution View → 44

The correct value of cell potential in volt for the reaction that occurs when the following two half cells are connected, is aligned & Fe _ ( aq ) ²⁺+2 e ⁻ Fe ( s ), E ^ =-0.44 ~V

NEET 2023 Solution View → 45

The E^ values for aligned & Al ⁺ / Al =+0.55 ~V and Tl ⁺ / TI =-0.34 ~V & Al ³⁺ / Al =-1.66 ~V and Tl ³⁺ / TI =+1.26 ~V aligned Identify the incorrect statement.

NEET 2023 Solution View → 46

The conductivity of centimolar solution of KCl at 25 ° C is 0 . 0210   ohm - 1   cm - 1 and the resistance of the cell containing the solution at 25 ° C is 60 &

NEET 2023 Solution View → 47

Two half cell reactions are given below : CO ³⁺+ e ⁻ Co ²⁺, E ^ Co ²⁺ / Co ³⁺=-1.81 ~V 2 Al ³⁺+6 e ⁻ 2 Al ( s ), E ^ o Al / Al ³⁺=+1.66 ~V The standard EMF of a cell with feasible

NEET 2022 Solution View → 48

Given below are half cell reactions : MnO 4 - + 8 H + + 5 e - → Mn 2 + + 4 H 2 O , E Mn 2 + / MnO 4 - o = - 1 . 510   V 1 2 O 2 + 2 H + + 2 e - → H 2 O E O 2 / H 2

NEET 2022 Solution View → 49

At 298   K , the standard electrode potentials of Cu 2 + / Cu ,   Zn 2 + / Zn ,   Fe 2 + / Fe and Ag + / Ag are 0 . 34   V , - 0 . 76   V , - 0 . 44  

NEET 2022 Solution View → 50

Find the emf of the cell in which the following reaction takes place at 298   K Ni ( s ) + 2 Ag + ( 0 . 001   M ) → Ni 2 + ( 0 . 001 M ) + 2 Ag ( s ) (Given that E

NEET 2022 Solution View → 51

Standard electrode potential for the cell with cell reaction Zn ( s )+ Cu ²⁺( aq ) Zn ²⁺( aq )+ Cu ( s ) is 1.1 ~V . Calculate the standard gibbs energy change for the cell reactio

NEET 2022 Solution View → 52

The molar conductance of NaCl ,   HCl and CH 3 COONa at infinite dilution are 126 . 45 ,   426 . 16 and 91 . 0   Scm 2   mol - 1 respectively. The molar conduct

NEET 2021 Solution View → 53

The molar conductivity of 0 . 007   M acetic acid is 20   S   cm 2   mol - 1 . What is the dissociation constant of acetic acid? Choose the correct option. &#95

NEET 2021 Solution View → 54

Identify the reaction from following having top position in EMF series (Std.red. potential) according to their electrode potential at 298   K .

NEET 2020 Solution View → 55

The number of Faradays(F) required to produce 20   g of calcium from molten CaCl 2 (Atomic mass of Ca = 40   g   mol – 1 ) is

NEET 2020 Solution View → 56

In a typical fuel cell, the reactants (R) and product (P) are :-

NEET 2020 Solution View → 57

Calculate emf of the following cell at 25^ C if value of E_ cell ^ is 4 ~V (Given R T / F 10=0.06 ) : M |M_ (0.01 M ) ²⁺ | |M_ (0.0001 M ) ²⁺ | M

AIIMS 2019 Solution View → 58

. Given, E _ Cr ³⁺ / Cr ^0=-0.72 ~V , E _ fe ²⁺ / Fe =-0.42 ~V . The potential for the cell Cr Cr ³⁺(0.1 M ) | Fe ²⁺(0.01 M ) Fe is

JIPMER 2019 Solution View → 59

The standard electrode potential ( E ⁻ ) values of ( Al ³⁺ / Al , Ag ⁺ / Ag , K ⁺ / K . and Cr ³⁺ / Cr are -1.66 ~V , 0.80 ~V , 2.93 ~V and -0.74 ~V , respectively. The correct dec

NEET 2019 Solution View → 60

Following limiting molar conductivities are given as given as aligned & _ m ( H ₂ SO ₄ ) ^0= x S cm ^2 ~mol ⁻¹ & _ m ( K ₂ SO ₄ ) ^0= y S cm ^2 ~mol ⁻¹ & aligned _ m ( CH ₂ COOK )

NEET 2019 Solution View → 61

For a cell involving one electron E c e l l ⊝ = 0.59   V at 298   K , the equilibrium constant for the cell reaction is: G i v e n   t h a t   2.303 &#160

NEET 2019 Solution View → 62

0.1 M solution is present in a conductivity cell with electrode of 100 ~cm ^2 area placed 1 ~cm apart and resistance observed is 5 10^3 ohm . What is the molar conductivity of this

AIIMS 2018 Solution View → 63

Time taken to completely decompose 36 ~g of water by passing 3 ~A current is

AIIMS 2018 Solution View → 64

Assertion : Reverse current flows in charging of lead storage battery. Reason : During charging, PbSO ₄ converts into Pb and PbO ₂ .

AIIMS 2018 Solution View → 65

Assertion : Molar conductivity of a weak electrolyte at infinite dilution cannot be determined experimentally. Reason : Kohlrausch law helps to find the molar conductivity of a wea

AIIMS 2018 Solution View → 66

Cell equation : A+2 B⁺ A²⁺+2 BA²⁺+2 e⁻ A ; E^ =+0.34 ~V and ₁₀ K=15.6 at 300 ~K for cell reactions. Find E^ for B⁺+e⁻ B . [ . Given : 2.303 R T n F =0.059 at .300 ~K ]

AIIMS 2018 Solution View → 67

Assertion : Electrolysis of NaCl _ (a q) produces Na metal. Reason : Na ⁺ is obtained at cathode.

AIIMS 2018 Solution View → 68

For the electrochemical cell, Ag ⁻| AgCl | KCl || AgNO ₃ Ag ⁺ , the overall cell reaction is

JIPMER 2018 Solution View → 69

The product of electrolysis of aqueous NaCl solution on anode and cathode respectively is

JIPMER 2018 Solution View → 70

If molar conductivity of Ca ²⁺ and Cl ⁻ ions are 119 and 71 Sm ^2 ~mol ⁻¹ respectively, then the molar conductivity of CaCl ₂ at infinite dilution is

JIPMER 2018 Solution View → 71

If E ^ ( Zn ²⁺, Zn )=-0.763 ~V and E ^ ( Fe ²⁺, Fe )=-0.44 ~V , then the emf of the cell Zn | Zn ²⁺( a =0.00 l ) | Fe ²⁺( a =0.005) | Fe is

JIPMER 2018 Solution View → 72

Consider the change in oxidation state of Bromine corresponding to different emf values, as shown in the diagram below: Then, what is the species undergoing disproportionation?

NEET 2018 Solution View → 73

Assertion : If standard reduction potential for the reaction Ag ⁺+e⁻ Ag is 0.80 volt, then for the reaction 2 Ag ⁺+2 e⁻ 2 Ag , it will be 1.60 volt. Reason: If concentration of Ag

AIIMS 2017 Solution View → 74

appropriate molar conductances of the electrolytes listed in the given table at infinite dilution in H ₂ O at 25^ C .

AIIMS 2017 Solution View → 75

On the basis of standard electrode potential of redox couples given below, find out which of the following is the strongest oxidising agent. (E^ . values : Fe ³⁺ | Fe ²⁺=+0.77 ~V ;

AIIMS 2017 Solution View → 76

The standard reduction potential for Zn ²⁺ / Zn , Ni ²⁺ / Ni and Fe ²⁺ / Fe are -0.76 , -0.23 and -0.44 V , respectively. The reaction X+Y²⁺ X²⁺+Y will be spontaneous when

JIPMER 2017 Solution View → 77

When a lead storage battery is discharged;

JIPMER 2017 Solution View → 78

The value of reaction quotient (Q) , for the following cell Zn (s) | Zn ²⁺(0.01 M ) | | Ag ⁺(1.25 M ) | Ag (s) is

JIPMER 2017 Solution View → 79

How many Faradays of electricity are required for the given reaction to occur? MnO ₄⁻ Mn ²⁺

AIIMS 2016 Solution View → 80

A conductivity cell has a cell constant of 0.5 ~cm ⁻¹ . This cell when filled with 0.01 M NaCl solution has a resistance of 384 ohms at 25^ C . Calculate the equivalent conductance

AIIMS 2016 Solution View → 81

Assertion : In electrolysis, the quantity of electricity needed for depositing 1 mole of silver is different from that required for 1 mole of copper. Reason : The molecular weights

AIIMS 2016 Solution View → 82

Choose the correct statement from the following.

JIPMER 2016 Solution View → 83

When an iron object is plated with tin, tin does not act as sacrificial anode in protecting against corrosion, because.

JIPMER 2016 Solution View → 84

For the cell reaction Pb + Sn ²⁺ Pb ²⁺+ Sn Given that, Pb Pb ²⁺, E^ =0.13 ~V Sn ²⁺+2 e⁻ Sn ; E^ =-0.14 ~V What would be the ratio of cation concentration for which E=O ?

JIPMER 2016 Solution View → 85

The molar conductivity of a 0.5   mol   dm - 3 solution of A g N O 3 with electrolytic conductivity of 5.76 × 10 - 3   S   c m - 1 at 298   K

NEET 2016 Solution View → 86

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

NEET 2016 Solution View → 87

If the E c e l l o for a given reaction has a negative value, which of the following gives the correct relationship for the values of ∆ G o and K e q ?

NEET 2016 Solution View → 88

What is the amount of chlorine liberated when 2 ~A of current is passed for 60 minutes in an aqueous solution of NaCl ?

AIIMS 2015 Solution View → 89

Assertion : Pure iron when heated in dry air is covered with a layer of rust. Reason : Rust has the composition Fe ₃ O ₄ .

AIIMS 2015 Solution View → 90

Assertion : Zinc displaces copper from copper sulphate solution. Reason : The E_ 298 ~K ^ of Zn is -0.76 ~V and that of Cu is +0.34 ~V .

AIIMS 2015 Solution View → 91

A student made the following observations in the laboratory. I. Clean copper metal did not react with 1 molar Pb ( NO ₃ )₂ solution II. Clean lead metal dissolved in a 1 molar AgNO

JIPMER 2015 Solution View → 92

The conductivity of 0.001028 ~mol ~L ⁻¹ acetic acid is 4.95 10⁻⁵ ~S ~cm ⁻¹ . Find out its dissociation constant if _ m for acetic acid is 390.5 ~S ~cm ⁻¹ ~mol ⁻¹ .

JIPMER 2015 Solution View → 93

Point out the incorrect reaction from the following.

JIPMER 2015 Solution View → 94

Which cell will measure standard electrode potential of copper electrode?

AIIMS 2014 Solution View → 95

Assertion: Conductivity of all electrolytes decreases on dilution. Reason: On dilution number of ions per unit volume decreases.

AIIMS 2014 Solution View → 96

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

JIPMER 2014 Solution View → 97

If the E_ cell ^ for a given reaction has a negative value then which of the following gives the correct relationships for the values of G^ and K_ eq ?

JIPMER 2014 Solution View → 98

Electrode potential of hydrogen electrode is 18 mV , then [ H ⁺ ] is

AIIMS 2013 Solution View → 99

Assertion : Magnesium is extracted by the electrolysis of fused mixture of MgCl ₂, NaCl and CaCl ₂ . Reason : Calcium chloride acts as a reducing agent.

AIIMS 2013 Solution View → 100

Which of the following statement is correct?

JIPMER 2013 Solution View → 101

Which of the following statement is not correct about an inert electrode in a cell?

JIPMER 2013 Solution View → 102

For Zn ²⁺ Zn , E^ =-0.76 ~V then EMF of the cell Zn / Zn ²⁺(1 M ) |2 H ⁺(1 M ) | H ₂ (1 atm) will be

AIIMS 2012 Solution View → 103

Assertion : A reaction is spontaneous if E_ cell =+ ve. Reason : For E_ cell =+ ve , G is always -ve.

AIIMS 2011 Solution View → 104

Electrolysis of fused NaCl will give

JIPMER 2011 Solution View → 105

Calculate _ H O A C ^ using appropriate molar conductances of the electrolytes listed above at infinite dilution in H ₂ O at 25^ C .

AIIMS 2010 Solution View → 106

For the electrochemical cell, M |M⁺ | X⁻ | X , E^ (M⁺ M )=0.44 ~V and E^ (X X⁻ )=0.33 ~V . From this data one can deduce that

AIIMS 2010 Solution View → 107

A factory produces 40 ~kg of calcium in two hours by electrolysis. How much aluminium can be produced by same current in 2 hours if current efficiency is 50 % ?

AIIMS 2010 Solution View → 108

How long it will take to deposit 1.0 g of chromium when a current of 1.25 A flows through a solution of chromium (III) sulphate ? (Molar mass of Cr =52 )

JIPMER 2010 Solution View → 109

The specific conductance of a N/10 KCl at 25^ C is 0.0112 ohm ⁻¹ ~cm ⁻¹ . The resistance of cell containing solution at the same temperature was found to be 55 ohm . The cell const

AIIMS 2009 Solution View → 110

Hydrofluoric acid is a weak acid. At 25^ C , the molar conductivity of 0.002 M HF is 176.2 ⁻¹ ~cm ^2 ~mol ⁻¹ . If its _m^ =405.2 ⁻¹ ~cm ^2 ~mol ⁻¹ . Equilibrium constant at the giv

AIIMS 2009 Solution View → 111

The compounds formed at anode in the electrolysis of an aqueous solution of potassium acetate, are

JIPMER 2009 Solution View → 112

What is the electrode potential (in V ) of the following electrode at 25^ C ? Ni ²⁺(0.1 M ) Ni (s) (Standard reaction potential of Ni ²⁺ Ni is -0.25 ~V , 2.303 R T F =0.06 )

JIPMER 2009 Solution View → 113

The time period to coat a metal surface of (80 ~cm ^2 ) with (5 10⁻³ ~cm ) thick layer of silver (density (1.05 ~g ~cm ⁻³ ) ) with the passage of (3 ~A ) current through a silver n

AIIMS 2008 Solution View → 114

For the following concentration cell, to be spontaneous ( Pt ( H ₂ ) P₁ ) atm. (| HCl | Pt ( H ₂ ) P₂ ) atm. Which of the following is correct?

AIIMS 2008 Solution View → 115

The standard oxidation potential (E^ ) for the half cell reaction are [ array ll Zn Zn ²⁺+2 e⁻ ; & E^ =+0.76 ~V Fe Fe ²⁺+2 e⁻ ; & E^ =+0.41 ~V array ] (E M F ) of the cell reaction

AIIMS 2008 Solution View → 116

To observe the effect of concentration on the conductivity of electrolytes of different nature were taken in two vessels (A ) and (B . A ) contains weak electrolyte ( NH ₄ OH ) and

AIIMS 2008 Solution View → 117

Assertion : Copper metal gets readily corroded in acidic aqueous solution. Reason : Free energy change for this process is negative.

AIIMS 2008 Solution View → 118

The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water is

JIPMER 2008 Solution View → 119

Assertion : Copper sulphate solution is not stored in zinc vessel. Reason : Zinc forms complex with ( CuSO ₄ ).

AIIMS 2007 Solution View → 120

4.5 g of aluminium (Atomic mass 27 amu) is deposited at cathode from Al ³⁺ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H ⁺ ions i

JIPMER 2007 Solution View →
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