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

1. Zn acts as an oxidising agent when it reacts with HNO3
2. HNO3 is weaker acid than H2SO4 and HCl
3. In electrochemical series, Zn is above hydrogen
4. NO3− is reduced in preference to hydronium ion

Correct answer: NO3− is reduced in preference to hydronium ion

Solution

Zn does not produce H2 gas with HNO3 because HNO3 is a strong oxidizing agent, and it reduces NO3− ions instead of producing H2 gas. The reaction leads to the formation of nitrogen oxides instead.

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