Question

Hydrogen gas is not evolved when a metal reacts with nitric acid then what do they form? Are there any exceptions if yes mention those.

Answer 1

because  nitric  acid  is  good  oxidising   agent   then  the  hydrogen  evolve  during  reaction   get  oxidised  and  converted   into  water   so  we  cannot   react  metal  with  nitric  acid

Answer 2

Nitric acid on reacting with  HNO3 forms water and gets reduced to any of nitrogen oxide. Because nitric acid is a strong oxidising agent.

EXCEPTION: Magnesium and Manganese react with very dilute nitric acid to release h2 gas.