Ncert Exercises & Solutions

Consider the figure and answer the following questions.

1. Cell A’ has E_cell = 2V and Cell ‘B’ has E_cell = 1.1 V which of the two cells ‘A’ or ‘B’ will act as an electrolytic cell. Which electrode reactions will occur in this cell?

2. If cell A’ has E_cell = 0.5V and cell ‘B’ has E_cell = 1.1 V then what will be the reactions at anode and cathode?

(i) Cell ‘B’ will act as electrolytic cell due to its lesser value of emf.

The electrode reactions will be

At cathode Zn²⁺ + 2e^-

\to

At anode Cu

\to

Cu²⁺ + 2e^-

(ii) If cell ‘B’ has higher emf, it acts as galvanic cell.
Now it will push electrons into cell ‘A’

In this case, the reactions will be

\to

Zn²⁺ + 2e^- (At anode)
Cu²⁺ + 2e^-

\to

Cu (At cathode)

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