Q.
Zn gives H2 gas with dil.H2SO4 and HCl but not with dil.HNO3 because
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a
Zn acts as oxidising agent when reacts with HNO3
b
HNO3 is weaker acid than H2SO4 and HCl
c
In electrochemcial series Zn is above hydrogen
d
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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