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Preparation of Hydrogen

Which of the ...

Question

Which of the following combination will produce $H_{2}$ gas?

A

F e

metal and conc.

H N O_{3}

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B

C u

metal and conc.

H N O_{3}

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C

Z n

metal and

N a O H

(aq.)

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D

A u

metal and

N a C N

(aq.) in the presence of air

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Solution

The correct option is C $Z n$ metal and $N a O H$ (aq.)
$Z n + 2 N a O H \to N a_{2} Z n O_{2} + H_{2} ↑$

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