Question

Why do metals not evolve hydrogen gas with nitric acid?​

Answer 1

Answer:

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Explanation:

Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO3 is a strong oxidising agent. It oxidises the H2 produced to water and itself gets reduced to any of the nitrogen oxides (N2O, NO, NO2).

Answer 2

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Why do metals not evolve hydrogen gas with nitric acid?

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When metals reacts with nitric acid(HNO3), hydrogen gas is not evolved. This is because HNO3 is a strong oxidising agent. It oxidises H2 produced to water and is itself reduced to any of the oxides of nitrogen(NO2,N2O,NO). For example :-

3Cu(s) + 8HNO3(aq) -----------) 3Cu(NO3)2(aq) + 2NO(g) + 4H2O(l)

But, magnesium and manganese react with very dilute HNO3 acid to produce H2 gas.

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