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Q.

Generally metal reacts with acids and forms salt and hydrogen gas. Here, which of the following acids does not give hydrogen gas when reacting with metals (except Mn and Mg)?

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a

H2SO4

b

HCl

c

HNO3

d

All of these

answer is C.

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Detailed Solution

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HNO3 does not give hydrogen gas when reacting with metals (except Mn and Mg).
When a metal reacts with HNO3, H2 is not released. This happens because HNO3 is a strong oxidising agent. Therefore, as soon as the H2 gas is formed, it oxidises to water. As a result, no hydrogen gas is produced during the reaction. Instead, it produces nitric oxides. So, HNO3 does not give hydrogen gas when reacting with metals.

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Generally metal reacts with acids and forms salt and hydrogen gas. Here, which of the following acids does not give hydrogen gas when reacting with metals (except Mn and Mg)?