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Question

On the basis of position in the electrochemical series, the metal which does not displace H2 from water and acid is :

A
Hg
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B
Al
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C
Pb
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D
Ba
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Solution

The correct option is A Hg
Because Reduction potential EMn+/M in case of Hg is +ve while in case of other it is ve. So reduction of H++e12H2 will occur in all three other cases. So they will displace H2 from water and acid.

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