Chemistry Class 12 NCERT Solutions: Chapter 3 Electrochemistry Part 8

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Q: 12. How much charge is required for the following reductions?

(i)

(ii)

(iii)

Ans:

(i)

Required charge

(ii)

Required charge

(iii)

i.e.

Required charge

Q: 13. How much electricity in terms of Faraday is required to produce

(i)

(ii)

Ans:

(i) According to the question,

Electricity required to produce of calcium

Therefore, electricity required to produce of calcium

(ii) According to the question,

Electricity required to produce

Therefore, electricity required to produce of

Q: 14. How much electricity is required in coulomb for the oxidation of

(i)

(ii)

Answer:

(i) According to the question,

Now, we can write:

Electricity required for the oxidation of mol of

(ii) According to the question,

Electricity required for the oxidation of

Q: 15. A solution of is electrolysed between platinum electrodes using a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?

Ans:

Given,

Current

Time

According to the reaction,

Nickel deposited by

Therefore, nickel deposited by 6000 C

Hence, of nickel will be deposited at the cathode