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Question

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is:


A
Cu
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B
Cr
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C
Ag
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D
Ca
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Solution

The correct option is B $$Ca$$
The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is Ca. This is because, the standard reduction potential for the reduction of water is higher than that for the reduction of $$Ca^{2+}$$. Hence, water has much greater tendency to get reduced than $$Ca^{2+}$$ ion . Hence, at cathode, water will be preferentially reduced to form hydrogen gas and hydroxide ions.

$$2H_2O(l) + 2e^- \rightarrow H_2(g) +2OH^-(aq)$$, $$E^0_{red}=-0.83  V$$.

Chemistry
NCERT
Standard XII

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