On reaction of moist \( \mathrm{SO}_{2} \) with potassium permangnate, (Acidic) which is correct...

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On reaction of moist \( \mathrm{SO}_{2} \) with potassium permangnate, (Acidic) which is correctly observed?
\( \mathrm{P} \)
(1) Colour of \( \mathrm{KMnO}_{4} \) is decolourised
\( \mathrm{W} \)
(2) \( \mathrm{SO}_{2} \) is oxidised to \( \mathrm{SO}_{3} \)
(3) \( \mathrm{MnO}_{4}^{-} \)is reduced to \( \mathrm{MnO}_{2} \)
(4) All of these
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