Which of the following pairs of cations cannot be separated by adding and to the…

CHEMISTRY · Single correct · A Level · Chemistry · Reactions of ions in aqueous solution · Reactions of ions in aqueous solution

Problem

Which of the following pairs of cations cannot be separated by adding

NH_4Cl

and

NH_4OH

to the mixture and then passing

H_2S

through it? (1)

Co^{2+}

Ca^{2+}

(2)

Ni^{2+}

Sr^{2+}

(3)

Co^{2+}

Ni^{2+}

(4)

Zn^{2+}

Ba^{2+}