Question

Which compound on reaction with HCl gives a yellow residue?

Answer 1

Explanation:

Upon mixing of concentratedhydrochloric acid and concentrated nitric acid, chemical reactionsoccur. These reactions result in the volatile products nitrosyl chloride and chlorine gas: HNO3 (aq) + 3 HCl (aq) → NOCl (g) + Cl2 (g) + 2 H2O. as evidenced by the fuming nature and characteristic yellow color of aqua regia.