Chemistry

Problem

A coloured solution known to contain two metal ions, was treated with excess cold sodium hydroxide solution. When filtered a whitish solid, slowly changing to brown, was retained on the filter paper and a colourless solution collected as the filtrate. Dropwise addition of hydrochloric acid to the filtrate produced a white ppt. which dissolved in excess acid. Treatment of the residue on filter paper with a solution of strong oxidiser produced a reddish-violet solution. Indicate any pairs of ions: a.

\text{Zn}^{2+}

and

\text{Mn}^{2+}

ions b.

\text{Mg}^{2+}

and

\text{Zn}^{2+}

ions c.

\text{Mn}^{2+}

and

\text{Mg}^{2+}

ions d.

\text{Fe}^{2+}

and

\text{Zn}^{2+}

ions

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