When nitric acid $H N O_{3}$ reacts with metals, hydrogen gas is not observed because

Metallic hydrides are formed.

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Hydrogen is oxidised by nitric acid.

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Metal weakly react with nitric acid.

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Hydrogen is reduced by nitric acid.

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Solution

The correct option is B
Hydrogen is oxidised by nitric acid.

Most of the metals do not react with $H N O_{3}$ because it is a strong oxidizing agent.
Since hydrogen is a reducing agent, nitric acid oxidises the hydrogen produced to water and itself undergoes reduction to give $N_{2} O$ , $N O$ , $N O_{2}$ , $N_{2}$ and $N H_{3}$ .
Hence, when metals (except Mn and Mg) are treated with nitric acid, hydrogen gas is not liberated.

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When nitric acid $H N O_{3}$ reacts with metals, hydrogen gas is not observed because

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