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Which one of the following species is stable in aqueous solution?

1. MnO4⁻
2. MnO4²-
3. Cu+
4. Cr2+

Correct answer: MnO4⁻

Solution

MnO4⁻ (Mn +7) is stable in aqueous solution, whereas MnO4²- and Cu+ disproportionate and Cr2+ is rapidly oxidised by air/water.

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