Chemistry

Problem

Which one among the following pairs of ions cannot be separated by

\text{H}_2\text{S}

in dilute

\text{HCl}

? a.

\text{Bi}^{3+}

\text{Sn}^{2+}

\text{Al}^{3+}

\text{Hg}^{2+}

\text{Zn}^{2+}

\text{Cu}^{2+}

\text{Ni}^{2+}

\text{Cu}^{2+}