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Preparation of Hydrogen

Which one of ...

Question

Which one of the following metals cannot evolve $H_{2}$ from acids or $H_{2} O$ or from its compounds?

A

Hg

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B

Al

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C

Pb

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D

Fe

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Solution

The correct option is C Hg
$H g$ has greater reduction potential than that of $H^{+}$ and hence cannot displace hydrogen from acid.

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