Question 40
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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Hydrogen gas is not liberated when the following metal is added to dil. HCl

The correct option is A AgSilver (Ag) do not liberates hydogen from HCl as the silver is less reactive than hydrogen. Hydrogen gas is not liberated when the Ag metal is added to dil.HCl. Hence, option A is correct.

Hydrogen gas is not liberated when the following metal is added to dil. $H C l$

The correct option is A $A g$
Silver ( $A g$ ) do not liberates hydogen from $H C l$ as the silver is less reactive than hydrogen. Hydrogen gas is not liberated when the $A g$ metal is added to dil. $H C l$ . Hence, option A is correct.