Question

Give reasons :
The reaction of Zn with dil. HNO3 does not produce hydrogen gas.​

Answer 1

Zn doesn't react with HNO3 because HNO3 is an highly oxidising agent...

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Answer 2

Generally, metals react with dilute acids, producing the corresponding salt and evolve Hydrogen gas, as follows:

Metal + dil. Acid → Metal Salt + Hydrogen gas.

But, in case of dilute Nitiric acid (HNO3), it is a very strong oxidising agent. So, it oxidised the Hydrogen gas, so produced into Water, and itself gets reduced into one of the nitrogen oxides, such as Nitrogen oxide/Nitrogen dioxide/Nitrous oxide. So,

Metal + dil. Nitric Acid → Metal Nitrate + Water + NO/NO2/N2O.

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