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Preparation of Hydrogen from Cold Water and Metals

Among the fol...

Question

Among the following, which element reacts with hydrogen to form a compound A and on treatment with water liberates hydrogen gas?

A

Chlorine

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B

Selenium

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C

Calcium

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D

Nitrogen

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Solution

The correct option is C
Calcium

$C a + H_{2} \to C a H_{2}$

$C a H_{2} + H_{2} O \to C a (O H)_{2} + 2 H_{2}$

Thus, the element is calcium.

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