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

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Solution

The correct option is D Ca
This metal is Ca as Calcium is obtained by electrolysis of $C a C l_{2}$ . Ca reacts with hydrogen to form calcium hydride ( $C a H_{2}$ ) which is a colourless solid. Calcium hydride reacts with water to form calcium hydroxide and dihydrogen gas.
$C a H_{2} + 2 H_{2} O \to C a (O H)_{2} + 2 H_{2}$

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