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Metals Reaction with Acid

Mn + dil.HNO3...

Question

Mn + dil.HNO₃→ Salt + ?

A

Nitrate

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B

Hydrogen

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C

Oxygen

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D

Nitrogen oxide

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Solution

The correct option is B
Hydrogen

Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because $H N O_{3}$ is a strong oxidising agent. It oxidises the $H_{2}$ produced to water and itself gets reduced to any of the nitrogen oxides ( $N_{2} O$ , $N O$ , $N O_{2}$ ). But magnesium (Mg) and manganese (Mn) react with very dilute $H N O_{3}$ to evolve $H_{2}$ gas.

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