Q.

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

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Zn acts as oxidising agent when reacts with HNO3

HNO3 is weaker acid than H2SO4 and HCl

In electrochemcial series Zn is above hydrogen

NO3- is reduced in preference to H+ ion

answer is D.

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Detailed Solution

Zn + H2SO4 → ZnSO4 + H2↑Zn + 2HCl → ZnCl2 + H2↑EH+/12H2,pt°= 0 (Arbitrarily taken as zero)Where as ENO3-/NO2°;ENO3-/N2O° are positive. Therefore, NO3- reduces to oxide nitrogen but not H+ to H2. Thus NO3- ion reduces in preference to H+ ion.4Zn + 10 HNO3 (dil ) →4 Zn(NO3)2 + 5H2O +N2OZn + 4 HNO3 (conc) →Zn(NO3)2 + 2H2O +2NO2

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