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

CHEMISTRY · Single correct · GCSE · Chemistry · Chemical Analysis · Chemical Analysis

Problem

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

\text{NaOH}

solution? (1)

\text{Fe}^{3+}

\text{Al}^{3+}

(2)

\text{Cr}^{3+}

\text{Al}^{3+}

(3)

\text{Sn}^{2+}

\text{Pb}^{2+}

(4)

\text{Cu}^{2+}

\text{Pb}^{2+}