what happens when concentrated acid reacts with metal? what are the products and which gas comes out?
Metal + Dilute acid ? Salt + Hydrogen
Metals like sodium, potassium react violently.
2 Na + 2 HCl ? 2 NaCl + H2
Magnesium reacts quite rapidly with dilute HCl.
Mg + 2 HCl ? MgCl2 + H2
Nitric acid (HNO3) is a strong oxidising agent. It oxidises the H2 gas produced to water and itself gets reduced to any of the nitrogen oxides (N2O, NO, NO2).that is Why hydrogen gas is not evolved when a metal reacts with nitric acid