Class XII Chemistry Important Questions on Redox Reactions and Electrochemistry

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Question 1

Alkaline cell is similar to dry cell. Which electrolyte is used in it?

• AAmmonium Chloride
• BPotassium hydroxide
• CZinc chloride
• DManganese dioxide

Question 2

The equivalent conductance of NaCl, HCl, C₂H₅COONa at infinite dilutions are 126.45, 426.16, 91 ohm^-1cm². The equivalent conductance of C₂H₅COOH is

• A201.28
• B390.71
• C698.28
• D540.48

Question 3

A current of 3A are was passed through a solution of a AuCl₄^- ions using gold electrode and it caused deposition of 1.234 g of gold (atomic mass 197). The time for which current was passed is

• A20 minutes 8 seconds
• B30 minutes 12 seconds
• C10 minutes 4 seconds
• D10 minutes 40 seconds

Question 4

The substance formed at cathode by electrolysis of 2M aq. NaCl is:

• Achlorine
• BOxygen
• CSodium
• DHydrogen

Question 5

In electrorefining of lead, pure lead is deposited on the cathode from an impure lead anode. Lead is:

• Areduced at anode
• Boxidized at anode
• Creduced at cathode and anode
• Doxidized at anode and cathode

Question 6

Consider the reaction- Cr₂O₇^2- + 2I^- I₂ + 2Cr³⁺
E⁰_cell = 0.79 V; E⁰(Cr₂O₇^2-) =1.33 V; E⁰(I₂) = ?

• A0.18
• B-0.18
• C0.54
• D-0.54

Question 7

Which one of the following species is stable in aqueous solution?

• A
• B
• C
• D

Question 8

Excess of KI reacts with CuSO₄ solution and then Na₂S₂O₃ solution is added to it. Which of the statements is incorrect for this reaction?

• ACu₂I₂ is reduced
• BEvolved I₂ is reduced
• CNa₂S₂O₃ is oxidized
• DCuI₂ is formed

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