Question

Copper on reaction with dilute nitric acid gives.............. gas. options a) nitrogen b) nitrogen dioxide c) hydrogen d) nitric oxide​

Answer 1

Answer:

d) nitric oxide gas

Explanation:

as nitric acid is a strong oxidizing agent

Answer 2

Answer:

b) nitrogen dioxide

Explanation:

Nitric acid reacts with copper according to the reaction:

4 HNO3(l) + Cu(s) ==> Cu(NO3)2(s and aq) + 2 NO2(g) + 2 H2O(l)

The copper nitrate salt that forms is a deep blue color. The nitrogen dioxide is a maroon vapor.

So ,

If the nitric acid is dilute, the copper will be oxidized to form copper nitrate with nitric oxide as a byproduct. If the solution is concentrated, the copper will be oxidized to form copper nitrate with nitrogen dioxide as a byproduct.