In the Group IV analysis, precipitates as a buff-coloured sulphide. When this sulphide is dissolved and boiled with and concentrated , it produces a purple/red-violet solution. This colour is due to:

Question

In the Group IV analysis, $Mn^{2+}$ precipitates as a buff-coloured sulphide. When this sulphide is dissolved and boiled with $PbO_2$ and concentrated $HNO_3$, it produces a purple/red-violet solution. This colour is due to:

Prashant Kotian · Accepted Answer

Correct answer: C. The strong oxidizing agent in oxidizes to the state, forming permanganic acid (), which gives the intense purple solution.

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