Q.

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

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Zn acts as oxidant when reacts with HNO3

HNO3 is weaker acid than H2SO4 and HCI

In electrochemical series Zinc is above hydrogen

NO3– is reduced in preference to H3O+

answer is D.

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Detailed Solution

In HNO3 , H+ can reduce to H2 and NO-3 can reduce to NO or N2O, NO2.So NO-3 reduces in preference to H+ or H3O+ when HNO3 acts like oxidant.

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