A chloride salt on addition of alkali solution gives gas B which gives brown ppt

CHEMISTRY · Single correct · ICSE · Chemistry · Analytical Chemistry · Analytical Chemistry

Problem

A chloride salt on addition of alkali solution gives gas B which gives brown ppt. with Nessler's reagent. What is A, B and C? (1)

NH_4Cl

NH_3

and

HgO \cdot Hg(NH_2)(NO_3)

(2)

NH_4Cl

NH_3

and

Hg(NH_2)_2Cl

(3)

NH_4Cl

NH_3

and

HgO \cdot Hg(NH_2)Cl

(4)

NH_4Cl

NH_3

and

HgO \cdot Hg(NH_2)I