Question

Sulphide, which is insoluble in dilute $\text{HN}{\text{O}}_3$ :-

• A. $\text{PbS}$
• B. $\text{CuS}$
• C. $\text{CdS}$
• D. $\text{HgS}$

Answer 1

Answer: (D)

$\text{HgS}$ is insoluble in $HN{O}_3$ , it is soluble only in aqua regia.