Question

Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except $Mn$ and $Mg$)?

• A. $H_{2}S{O}_4$
• B. $HCl$
• C. $HN{O}_3$
• D. None of the above

Answer 1

The correct option is C $HN{O}_3$

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).