Addition of 6 m hcl to which substance will not result in gas evolution?
(a) al
(b) zn
(c) k2co3
(d) nano3

the answer is d but can someone explain how to get that answer, ?

The correct answer is Option D.

Explanation:

The reaction of HCl with every substance given in the option follows the equations:

The reaction of aluminium with hydrochloric acid produces aluminium chloride and hydrogen gas. The equation follows:

Thus, this substance evolve gas on reaction.

The reaction of zinc with hydrochloric acid produces zinc chloride and hydrogen gas. The equation follows:

Thus, this substance evolve gas on reaction.

The reaction of potassium carbonate with hydrochloric acid produces potassium chloride, water and carbon dioxide gas. The equation follows:

Thus, this substance evolve gas on reaction.

The reaction of sodium nitrate with hydrochloric acid produces sodium chloride and nitric acid. The equation follows:

Thus, this substance will not evolve gas on reaction.

Hence, the correct answer is Option D.