The metal that gives hydrogen gas upon treatment with both acids as well as bases is:

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None of the above

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Solution

The correct option is B Zn
Laboratory method: By the action of granulated zinc with dilute HCl.
$Z n + d i l . H C l ⟶ Z n C l_{2} + H_{2}$
Laboratory method: By the action of zinc with aqueous alkali.
$Z n + 2 N a O H Δ ⟶ N a_{2} Z n O_{2} + H_{2}$
So, correct option is b.

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