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In alkaline medium, thiosulphate ions ar...

In alkaline medium, thiosulphate ions are oxidised to sulphate ions by `MnO_4^-` ions. The oxidation number of Mn decreases by ______ units.

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The correct Answer is:
3
In alkaline medium,
`MnO_4^- rarr MnO_2`
The oxidation number of Mn decreases by 3 units
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