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Question

The metal which cannot liberate H2 gas from hydrochloric acid is:


A
Zn
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B
Cu
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C
Mg
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D
Al
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Solution

The correct option is B Cu
Cu is higher up in the electrochemical series than H+
Hence copper cannot reduce H+toH2
as SRPofCu>SRPofH+
and Ecell=SRPofH+SRPofCu2+<0
as Ecell<0
The reaction cannot take place.
Hence, option B is correct.

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