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The shift in color from green to purple occurs because of:

1. the transformation of Mn⁶⁺ into Mn⁷⁺
2. the transformation of Mn⁶⁺ into Mn⁴⁺
3. the transformation of Mn⁴⁺ into Mn⁷⁺
4. the transformation of Mn⁴⁺ into Mn⁶⁺

Correct answer: the transformation of Mn⁶⁺ into Mn⁷⁺

Solution

The green colour is MnO4^2- (manganate, Mn in +6); on disproportionation/oxidation it becomes purple MnO4^- (permanganate, Mn in +7). So the green-to-purple shift is the conversion of Mn6+ to Mn7+, option (a).

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