Chemistry Class 12 NCERT Solutions: Chapter 3 Electrochemistry Part 9

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Q: 16. Three electrolytic cells containing solutions of , and , respectively are connected in series. A steady current of 1.5 amperes was passed through them until of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited?

Ans:

According to the reaction:

is deposited by .

Therefore, of is deposited by

Given,

Current

Again,

Q: 17. Using the standard electrode potentials given in Table 3.1, predict if the reaction between the following is feasible:

(i)

(ii)

(iii)

(iv)

(v)

Ans:

(i)

Since for the overall reaction is positive, the reaction between and is feasible.

(ii)

Since for the overall reaction is positive, the reaction between and is feasible.

(iii) >

Since for the overall reaction is negative, the reaction between and is not feasible.

(iv) >

Since for the overall reaction is negative, the reaction between and is not feasible.

(v) >

Since for the overall reaction is positive, the reaction between and is feasible.