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Question

A metal 'X' is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form a colourless solid, from which hydrogen gas is released on treatment with water. The metal 'X' is :

A
Al
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B
Ca
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C
Cu
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D
Zn
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Solution

The correct option is B Ca
Calcium is obtained by electrolysis of CaCl2. Ca reacts with hydrogen to form calcium hydride (CaH2) which is a colourless solid. Calcium hydride reacts with water to form calcium hydroxide and dihydrogen gas.

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