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Question

Zn gives hydrogen with H2SO4 and HCl but not with HNO3 because?

A
Zn acts as oxidising agent when reacts with HNO3
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B
HNO3 is weaker acid than H2SO4 and HCl
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C
Zn is above the hydrogen in electrochemical series
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D
NO3 is reduced in preference to H+ ion
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Solution

The correct option is D NO3 is reduced in preference to H+ ion
Nitric acid is a very strong oxidising agent and hence it leads to the addition of oxygen to another substance. Thus when hydrogen is formed due to addition of nitric acid on zinc metal it oxidises hydrogen to water and thus the reaction becomes,
Zn+4HNO3Zn(NO3)2+2NO2+2H2O

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