The Number of moles of KMnO₄ that will be needed to react with one mole of sulphite ion in acidic solution is:

3/5

4/5

2/5

1

Solution

2/5

2 KMnO subscript 4 space plus space 3 straight H subscript 2 SO subscript 4 space rightwards arrow space straight K subscript 2 SO subscript 4 space plus space 2 MnSO subscript 4 space plus space 3 straight H subscript 2 straight O space plus space 5 space left square bracket straight O right square bracket left square bracket MnO subscript 4 superscript minus space plus space 8 straight H to the power of plus space plus space 5 straight e to the power of minus space rightwards arrow space Mn to the power of 2 plus end exponent space plus space 4 space straight H subscript 2 straight O right square bracket space straight x space 2 left parenthesis SO subscript 3 superscript 2 minus end superscript space plus space straight H subscript 2 straight O space rightwards arrow space SO subscript 4 superscript 2 minus end superscript space space plus 2 straight H to the power of plus space plus space 2 straight e to the power of minus right parenthesis space straight x space 5 _______________________________________ 2 MnO subscript 4 superscript minus space plus space 6 straight H to the power of plus space plus space 5 SO subscript 3 superscript 2 minus end superscript space rightwards arrow 2 Mn to the power of 2 plus end exponent space plus SO subscript 4 superscript 2 minus end superscript space plus space 3 straight H subscript 2 straight O

5 moles of sulphite ion react with = 2 moles of MnO₄^- So, 1 mole of sulphate ion react with = 2/5 moles of MnO₄^-.

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