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Displacement Reaction

The metal whi...

Question

The metal which gives hydrogen on treatment with acid as well as sodium hydroxide is :

A

iron

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B

zinc

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C

copper

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D

none of the above

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Solution

The correct option is B zinc
$Z n$ on reaction with both $N a O H$ (base) and $H C l$ (acid) can give $H_{2}$ gas.
Reactions are as follows:
$Z n + 2 H C l \to Z n C l_{2} + H_{2}$
$Z n + 2 N a O H \to N a_{2} Z n O_{2} + H_{2}$

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