Q.

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

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a

NO3 is reduced in preference to hydronium ion

b

In electrochemical series, Zn is above hydrogen NO3-

c

Zn acts as oxidizing agent when reacts with HNO3

d

HNO3 is weaker acid than H2SO4 and HCl

answer is D.

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Detailed Solution

Zinc is present on the top of Hydrogen in electrochemical series, So Zn displaces H2 from dilute H2SO4 & HCl. 

On the other hand ,HNO3 is an oxidizing agent .Hydrogen obtained in this reaction is converted in to H2O.

 

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