Question

Why is hydrogen gas not evolved when a metal other than mg and mn is treated with nitric acid?

Answer 1

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). But magnesium (Mg) and manganese (Mn) react with very dilute

HNO3 to evolve H2 gas.

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