Question

The compound insoluble in water is

(a) mercurous nitrate

(b) mercuric nitrate

(c) mercurous chloride

(d) mercurous perchlorate.

Answer 1

Correct option  (c) mercurous chloride

Explanation:

According to "solubility rule" following compounds are soluble in water:

(i) All common group IA and NH₄⁺ compounds.

(ii) All common NO₃^- (nitrate),CH₃COO^-(acetate), ClO₄^- (perchlorate) compounds

(iii) All common Cl^-, Br^-, I^- compounds, except those of Ag⁺, Pb²⁺, Cu+ and Hg₂²⁺ (mercurous)

(iv) All common SO₄^2- (sulphate) compounds, 

except those of Ca²⁺, Sr²⁺, Ba²⁺ and Pb²⁺.