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Electrochemistry — JEE Main & Advanced NSEC PYQs

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

52 questionsNSECSolutions on every page
1

NaOH solution is added dropwise to HCl solution and the conductance of the mixture is measured after addition of each drop. The variation of conductance with volume of NaOH added i

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Reaction E ₀ / V Ag Ag ⁺+ e ⁻ -0.80 Cr ³⁺+3 e ⁻ 3 Cr -0.74 Zn ²⁺+2 e ⁻ Zn -0.76 I ₂( ~s )+2 e ⁻ 2 I ⁻ 0.54 Co ²⁺+2 e ⁻ Co -0.28 Ni ²⁺+2 e ⁻ Ni -0.26 The best reducing agent among t

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When a medal is electroplated with silver (Ag)

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Given the E₀ values for the half reactions: aligned & Sn ⁴⁺+2 e ⁻ Sn ²⁺, 0.15 ~V & 2 Hg ²⁺+2 e ⁻ Hg ₂²⁺, 0.92 ~V & PbO ₂+4 H ⁺+2 e ⁻ Pb ²⁺+2 H ₂ O , 1.45 ~V aligned Which of the fo

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Reaction E ₀ / V Ag Ag ⁺+ e ⁻ -0.80 Cr ³⁺+3 e ⁻ 3 Cr -0.74 Zn ²⁺+2 e ⁻ Zn -0.76 I ₂( ~s )+2 e ⁻ 2 I ⁻ 0.54 Co ²⁺+2 e ⁻ Co -0.28 Ni ²⁺+2 e ⁻ Ni -0.26 E ^0 of the given cell is array

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Which of the following statements is not correct regarding the galvanic cells?

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The standard potentials (E^ ) of MnO ₄⁻ / Mn ²⁺ and MnO ₂ / Mn ²⁺ half cells in acidic medium are 1.51 V and 1.23 V respectively at 298 K . The standard potential of MnO ₄⁻ / MnO ₂

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The standard electrode potential ( E ^0 ) of the Daniel cell is 1.1 V and the overall cell reaction can be represented as Zn ( s )+ Cu ²⁺( aq ) Zn ²⁺( aq )+ Cu ( s ) . Under which

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The standard redox potential for the reaction 2 H ₂ O O ₂+4 H ⁺+4 e ⁻ is -1.23 V . If the same reaction is carried out at 25^ C and at pH =7 , the potential will be

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If the standard electrode potentials of Fe ³⁺ / Fe and Fe ²⁺ / Fe are -0.04 V and -0.44 V respectively, then that of Fe ³⁺ / Fe ²⁺ is

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An electrochemical cell was constructed with Fe ²⁺ / Fe and Cd ²⁺ / Cd at 25^ C with initial concentrations of [ Fe ²⁺ ]=0.800 M and [ Cd ²⁺ ]=0.250 M . The EMF of the cell when [

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A sample of water from a water tank has a resistance of 100 at 298 K , when placed in a conductivity cell of cell constant 0.2 ~m ⁻¹ . On dissolving 58.5 g of NaCl in the water tan

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When the pH of the system is increased by 2.0 units, maximum decrease in half cell potential for the reaction will be observed in

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The correct order of the following oxidizing agents in basic aqueous medium is: array ll CrO ₄ ²⁻ / Cr ³⁺ & E ^0=-0.11 ~V FeO ₄ ²⁻ / Fe ³⁺ & E ^0=+0.72 ~V MnO ₄ ²⁻ / Mn ³⁺ & E ^0=+

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The reaction that takes place during charging of the lead storage cell is given below 2 PbSO ₄( ~s )+2 H ₂ O ( ) Pb ( ~s )+ PbO ( ~s )+2 H ₂ SO ₄( aq ) If a current of 10.0 A is pa

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The reduction of O ₂ to H ₂ O in acidic solution has a standard reduction potential of 1.23 V . If the pH of the acid solution is increased by one unit, half cell potential will O

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Concentration of K ⁺ ions inside a biological cell was found to be 25 times higher than that outside. The magnitude of the potential difference between the two sides of the cell is

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Three Faradays of electricity are passed through aqueous solutions of AgNO ₃, NiSO ₄ and CrCl ₃ kept in three vessels using inert electrodes. The ratio (in moles) in which the meta

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Electrolysis of aqueous CuSO ₄(0.1 M ) was carried out in two cells I and II. In I, the electrodes are of Cu and in II they were of Pt . As the electrolysis proceeds pH of the elec

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A half-cell reaction represented by (i) as given below Fe ( OH )₂( ~s )+2 e⁻ Fe ( ~s )+2 OH ⁻( aq ) E^ =-0.9 ~V (i) takes place in two different electrochemical cells, I and II, in

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Latimer diagrams are the compact representations of electrochemical equilibria in substances of multiple oxidation states. The value of the potential, x , in the Latimer diagram of

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If the ratio of the concentrations of the oxidized and reduced forms of a species in an electrochemical reaction can be given as [ Ox ] /[ Red ]=1.0 10⁻³ , the correct expression a

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The Galvanic cell can be represented as Zn / Zn ²⁺(0.1 M ) / / Cu ²⁺(0.1 M ) / Cu . Among the following, the cell that can produce an EMF more than that of the Galvanic cell is ( E

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The conductivity of 0.10 M KCl solution at 298 K is 1.29 10⁻² ~S ~cm ⁻¹ . The resistance of this solution is found to be 28.44 . Using the same cell, the resistance of 0.10 M NH ₄

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Molten NaCl is electrolysed for 35 minutes with a current of 3.50 A at 40^ C and 1 bar pressure. Volume of chlorine gas evolved in this electrolysis is

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From the given standard electrode potentials array ll Sn ⁴⁺( aq )+2 e ⁻ Sn ²⁺( aq ) & E ^0=0.15 ~V Br ₂( l )+2 e ⁻ 2 Br ⁻( aq ) & E ^0=1.07 ~V array The approximate free energy cha

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Given the E₀ values for the half reactions: aligned & Sn ⁴⁺+2 e ⁻ Sn ²⁺, 0.15 ~V & 2 Hg ²⁺+2 e ⁻ Hg ₂²⁺, 0.92 ~V & PbO ₂+4 H ⁺+2 e ⁻ Pb ²⁺+2 H ₂ O , 1.45 ~V aligned Which of the fo

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Which of the following statements is not correct regarding the galvanic cells?

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NaOH solution is added dropwise to HCl solution and the conductance of the mixture is measured after addition of each drop. The variation of conductance with volume of NaOH added i

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Three Faradays of electricity are passed through aqueous solutions of AgNO ₃, NiSO ₄ and CrCl ₃ kept in three vessels using inert electrodes. The ratio (in moles) in which the meta

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The standard potentials (E^ ) of MnO ₄⁻ / Mn ²⁺ and MnO ₂ / Mn ²⁺ half cells in acidic medium are 1.51 V and 1.23 V respectively at 298 K . The standard potential of MnO ₄⁻ / MnO ₂

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Reaction E ₀ / V Ag Ag ⁺+ e ⁻ -0.80 Cr ³⁺+3 e ⁻ 3 Cr -0.74 Zn ²⁺+2 e ⁻ Zn -0.76 I ₂( ~s )+2 e ⁻ 2 I ⁻ 0.54 Co ²⁺+2 e ⁻ Co -0.28 Ni ²⁺+2 e ⁻ Ni -0.26 E ^0 of the given cell is array

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The conductivity of 0.10 M KCl solution at 298 K is 1.29 10⁻² ~S ~cm ⁻¹ . The resistance of this solution is found to be 28.44 . Using the same cell, the resistance of 0.10 M NH ₄

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When a medal is electroplated with silver (Ag)

Olympiad workbook Solution View → 35

Reaction E ₀ / V Ag Ag ⁺+ e ⁻ -0.80 Cr ³⁺+3 e ⁻ 3 Cr -0.74 Zn ²⁺+2 e ⁻ Zn -0.76 I ₂( ~s )+2 e ⁻ 2 I ⁻ 0.54 Co ²⁺+2 e ⁻ Co -0.28 Ni ²⁺+2 e ⁻ Ni -0.26 The best reducing agent among t

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The reduction of O ₂ to H ₂ O in acidic solution has a standard reduction potential of 1.23 V . If the pH of the acid solution is increased by one unit, half cell potential will O

Olympiad workbook Solution View → 37

From the given standard electrode potentials array ll Sn ⁴⁺( aq )+2 e ⁻ Sn ²⁺( aq ) & E ^0=0.15 ~V Br ₂( l )+2 e ⁻ 2 Br ⁻( aq ) & E ^0=1.07 ~V array The approximate free energy cha

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Concentration of K ⁺ ions inside a biological cell was found to be 25 times higher than that outside. The magnitude of the potential difference between the two sides of the cell is

Olympiad workbook Solution View → 39

The standard redox potential for the reaction 2 H ₂ O O ₂+4 H ⁺+4 e ⁻ is -1.23 V . If the same reaction is carried out at 25^ C and at pH =7 , the potential will be

Olympiad workbook Solution View → 40

The standard electrode potential ( E ^0 ) of the Daniel cell is 1.1 V and the overall cell reaction can be represented as Zn ( s )+ Cu ²⁺( aq ) Zn ²⁺( aq )+ Cu ( s ) . Under which

Olympiad workbook Solution View → 41

If the standard electrode potentials of Fe ³⁺ / Fe and Fe ²⁺ / Fe are -0.04 V and -0.44 V respectively, then that of Fe ³⁺ / Fe ²⁺ is

Olympiad workbook Solution View → 42

Molten NaCl is electrolysed for 35 minutes with a current of 3.50 A at 40^ C and 1 bar pressure. Volume of chlorine gas evolved in this electrolysis is

Olympiad workbook Solution View → 43

An electrochemical cell was constructed with Fe ²⁺ / Fe and Cd ²⁺ / Cd at 25^ C with initial concentrations of [ Fe ²⁺ ]=0.800 M and [ Cd ²⁺ ]=0.250 M . The EMF of the cell when [

Olympiad workbook Solution View → 44

The Galvanic cell can be represented as Zn / Zn ²⁺(0.1 M ) / / Cu ²⁺(0.1 M ) / Cu . Among the following, the cell that can produce an EMF more than that of the Galvanic cell is ( E

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If the ratio of the concentrations of the oxidized and reduced forms of a species in an electrochemical reaction can be given as [ Ox ] /[ Red ]=1.0 10⁻³ , the correct expression a

Olympiad workbook Solution View → 46

A sample of water from a water tank has a resistance of 100 at 298 K , when placed in a conductivity cell of cell constant 0.2 ~m ⁻¹ . On dissolving 58.5 g of NaCl in the water tan

Olympiad workbook Solution View → 47

The reaction that takes place during charging of the lead storage cell is given below 2 PbSO ₄( ~s )+2 H ₂ O ( ) Pb ( ~s )+ PbO ( ~s )+2 H ₂ SO ₄( aq ) If a current of 10.0 A is pa

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When the pH of the system is increased by 2.0 units, maximum decrease in half cell potential for the reaction will be observed in

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The correct order of the following oxidizing agents in basic aqueous medium is: array ll CrO ₄ ²⁻ / Cr ³⁺ & E ^0=-0.11 ~V FeO ₄ ²⁻ / Fe ³⁺ & E ^0=+0.72 ~V MnO ₄ ²⁻ / Mn ³⁺ & E ^0=+

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Electrolysis of aqueous CuSO ₄(0.1 M ) was carried out in two cells I and II. In I, the electrodes are of Cu and in II they were of Pt . As the electrolysis proceeds pH of the elec

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A half-cell reaction represented by (i) as given below Fe ( OH )₂( ~s )+2 e⁻ Fe ( ~s )+2 OH ⁻( aq ) E^ =-0.9 ~V (i) takes place in two different electrochemical cells, I and II, in

Olympiad workbook Solution View → 52

Latimer diagrams are the compact representations of electrochemical equilibria in substances of multiple oxidation states. The value of the potential, x , in the Latimer diagram of

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