Chemistry

Problem

Which of the following pairs of cations cannot be separate by using an

\text{NaOH}

solution? a.

\text{Fe}^{3+}

\text{Al}^{3+}

\text{Cr}^{3+}

\text{Al}^{3+}

\text{Sn}^{2+}

\text{Pb}^{2+}

\text{Cu}^{2+}

\text{Pb}^{2+}