An element reacts with hydrogen to form a compound 'A' which on treatment with water liberates hydrogen gas. The element can be:

Nitrogen

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Chlorine

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Selenium

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Calcium

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Solution

The correct option is D Calcium
Among all the elements, group II Calcium reacts rapidly with cold water to give hydrogen and a white precipitate of calcium hydroxide
$C a + 2 H_{2} O \to C a (O H)_{2} + H_{2} ↑$
Hence the correct answer is [D}

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

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An element reacts with hydrogen to form a compound 'A' which on treatment with water liberates hydrogen gas. The element can be:

The correct option is D CalciumAmong all the elements, group II Calcium reacts rapidly with cold water to give hydrogen and a white precipitate of calcium hydroxideCa+2H2O→Ca(OH)2+H2↑Hence the correct answer is [D}

The correct option is D Calcium
Among all the elements, group II Calcium reacts rapidly with cold water to give hydrogen and a white precipitate of calcium hydroxide
$C a + 2 H_{2} O \to C a (O H)_{2} + H_{2} ↑$
Hence the correct answer is [D}