Q.

Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because

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Zn acts as an oxidising agent when it reacts with HNO3

HNO3 is weaker acid than H2SO4 and HCl

In electrochemical series, Zn is above hydrogen

NO3⊝ is reduced in preference to hydronium ion.

answer is D.

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Detailed Solution

Zinc gives H2 gas with dil. H2SO4/HCl but not with HNO3 because in HNO3, NO3⊝, NO and NO2 (based upon the concentration of HNO3)[Zn +HNO3 → ZnNO32 + 2H]× 4(nearly 6%)HNO3 + 8H+→ NH3 + 3H2ONH3 + HNO3→ NH4NO3Zn +10HNO3 → 4ZnNO32 + NH4NO3 + 3H2OZn ishaving lesser reduction potential than hydrogen in electrochemical series. So Zn displaces H2 from dilute H2SO4 and HCl

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