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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Solution

It is because ${HNO}_{3}$ is a strong oxidising agent. It oxidises the $H_{2}$ produced to $H_{2} O$ . For example:

$Cu + 4 {HNO}_{3} ⟶ {Cu(NO}_{3})_{2} + 2 {NO}_{2} + 2 H_{2} O$

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Reaction of Metals with Acid

Standard VIII Chemistry

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Question 40 Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg) are treated with HNO3, hydrogen is not liberated. Why?

It is because HNO3 is a strong oxidising agent. It oxidises the H2 produced to H2O. For example: Cu+4HNO3⟶Cu(NO3)2+2NO2+2H2O

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?

It is because ${HNO}_{3}$ is a strong oxidising agent. It oxidises the $H_{2}$ produced to $H_{2} O$ . For example:

$Cu + 4 {HNO}_{3} ⟶ {Cu(NO}_{3})_{2} + 2 {NO}_{2} + 2 H_{2} O$