Q48 / 159 · NTA Abhyas (NEET) 2020 · Chemistry · d and f Block Elements

The number of moles of $K M n O_{4}$ that will be needed to react with one mole of sulphite ion in acidic solution is

Correct answer
A
$\frac{2}{5}$
B
1
C
$\frac{4}{5}$
D
$\frac{3}{5}$

Solution

2 M n O_{4}^{-} + 6 H^{+} + 5 S O_{3}^{2 -} \to 2 M n^{2 +} + 5 S O_{4}^{2 -} + 3 H_{2} O

5 mol

S O_{3}^{2 -}

require

M n O_{4}^{-} = 2

mol
1 mol

S_{3}^{2 -}

ions require

M n O_{4}^{-} = \frac{2}{5}

mol.

Hence, the correct answer is option: 'A'.

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