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Preparation of Hydrogen

Which of the ...

Question

Which of the following will give $H_{2}$ gas with dilute ${H N O}_{3}$ ?

M g

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Z n

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C u

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H g

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Solution

The correct option is A $M g$
$M g + 2 H N O_{3} \to M g {(N O_{3})}_{2} + H_{2} (g)$
$^{'} M g^{'}$ being a strong reducing agent compared to zinc, copper and mercury produce hydrogen gas by reducing nitric acid.

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