Chemistry

Problem

Which of the following pairs of sulphides are insoluble in dilute

\text{HCl}

? a.

\text{CoS}

and

\text{NiS}

\text{CoS}

and

\text{MnS}

\text{NiS}

and

\text{MnS}

\text{NiS}

and

\text{ZnS}