The gas given off when a metal reacts with an acid is

hydrogen

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oxygen

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carbon dioxide

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water vapour

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Solution

The correct option is B hydrogen
When a metal reacts with an acid, the gas produced is hydrogen.

$M e t a l + A c i d \to S a l t + H y d r o g e n$

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Metal reacts with acid to produce hydrogen gas. But when metal reacts with $H N O_{3}$ hydrogen gas is not given out. Give a reason.

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