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Zn gives H₂gas with $H_{2} {SO}_{4}$ and HCI but not with HNO₃ because

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HNO₃ is weaker acid than H₂SO₄ and HCI

${NO}_{3}^{-}$ is reduced in preference to $H_{3} O^{+}$

In electrochemical series Zinc is above hydrogen

Zn acts as oxidant when reacts with HNO₃

answer is D.

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Detailed Solution

Nitric acid is a very strong oxidising agent and hence nitrate ion is reduced in preference to H⁺.

Thus when hydrogen is formed due to addition of nitric acid on zinc metal it oxidises hydrogen to water and thus the reaction becomes,

$Zn + 4 {HNO}_{3} \to Zn {({NO}_{3})}_{2} + 2 {NO}_{2} + 2 H_{2} O$

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