Redox and Equivalent ConceptHard
Question
The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is :
Options
A.2/5
B.3/5
C.4/5
D.1
Solution
1 L of the sol2KMnO4 + 3H2SO4 → K2SO4 + 2MnSO4 + 3H2O + 5 [O]
[SO32- + [O] → SO42- ] × 5
2KMnO4 + 3H2SO4 + 5SO32- → K2SO4 + 2MnSO4 + 3H2O + 2SO42-
5 moles of SO32- ≡ 2 moles of KMnO4
1 mole of SO32- ≡ 2/5 moles of KMnO4
[SO32- + [O] → SO42- ] × 5
2KMnO4 + 3H2SO4 + 5SO32- → K2SO4 + 2MnSO4 + 3H2O + 2SO42-
5 moles of SO32- ≡ 2 moles of KMnO4
1 mole of SO32- ≡ 2/5 moles of KMnO4
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