The number of moles of \( \mathrm{KMnO}_{4} \) needed to react with one mole of \( \mathrm{SO}_{...

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The number of moles of \( \mathrm{KMnO}_{4} \) needed to react with one mole of \( \mathrm{SO}_{3}^{2-} \) in acidic solution is
(A) \( 4 / 5 \)
(B) \( 2 / 5 \)
(C) 1
(D) \( 3 / 5 \)
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