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Question

(B) When metals react with most mineral acids (like $HCl$ or $H_2SO_4$),hydrogen gas $(H_2)$ is evolved.However,$HNO_3$ (nitric acid) is a very strong

Vedclass · Accepted Answer

Because $HNO_3$ is a strong oxidising agent.

Vedclass · Answer

(B) When metals react with most mineral acids (like $HCl$ or $H_2SO_4$),hydrogen gas $(H_2)$ is evolved.However,$HNO_3$ (nitric acid) is a very strong oxidising agent.When a metal reacts with $HNO_3$,the hydrogen gas produced is immediately oxidised to water $(H_2O)$ by the nitric acid.Consequently,the metal itself gets reduced to its corresponding nitrate salt,and the nitric acid is reduced to nitrogen oxides such as $N_2O$,$NO$,or $NO_2$.

$X$	$Y$
$1.$ Dehydrating agent	$p.$ Sulphur dioxide gas
$2.$ In preparation of firecrackers	$q.$ Concentrated sulphuric acid
$3.$ Weak bleaching agent	$r.$ Dihydrogen gas
$4.$ Lightest gas	$s.$ Sulphur

Generally,when metals are treated with mineral acids,hydrogen gas is liberated,but when metals (except $Mn$ and $Mg$) are treated with $HNO_3$,hydrogen is not liberated. Why?

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$X$ $Y$
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