Hydrogen is liberated from nitric acid by the action of:

nickel

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mercury

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magnesium

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copper

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Solution

The correct option is C magnesium
When metals react with nitric acid, hydrogen gas is liberated. Nitric acid is a very strong oxidizing agent.

So, it oxidizes the hydrogen gas formed during the reaction to form water and an oxide of nitrogen $(N O, N_{2} O, N O_{2})$

The reaction takes place as

$M g + 2 H N O_{3} \to M g (N O_{2})_{2} + H_{2} + O_{2}$

hence, hydrogen is librated from nitric acid by the action of magnesium.

Hence, te correct option is $C$

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Similar questions

(a) Explain why metals usually do not liberate hydrogen gas with dilute nitric acid.
(b) Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.

Q. When treated with nitric acid which of the following liberates hydrogen?

Q. Hydrogen gas is liberated by the action of aluminium with concentrated solution of ________.

Q. Hydrogen chloride is liberated by the action of

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

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