Which of the following reagents will not be useful in separating a mixture of and ?

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

Problem

Which of the following reagents will not be useful in separating a mixture of

\text{Zn}^{2+}

and

\text{Cu}^{2+}

? (1)

\text{H}_2\text{S}

in an acid medium (2)

\text{H}_2\text{S}

in an alkaline medium (3) Excess NaOH solution (4)

\text{NH}_3

solution