Question

generally metal do not produce h2 gas,when react with HNO3. why give reason​

Answer 1

Answer:

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.

Answer 2

Answer:

hydrogen gas is evolved when a metal reacts with nitric acid . it is because HNO3 is a strong oxidising agent. it oxidise the H2 produced to water and itself gets reduce to any if the nitrogen oxides (N2O No NO2)