NEET Chemistry Redox Reactions Questions Solved

NEET - 2007

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

(a) 35

(b) 45

(c) 25

(d) 1

 

2KMnO4 +3H2SO4           K2SO4 + 2MnSO4 + 2MnSO4 +3H2O +5OMnO4- + 8H+ + 5e-           Mn2++4H2O × 2    SO32- + H2O           SO42- + 2H++2e- × 5_______________________________________2MnO4-+6H+ + 5SO32-           2Mn2+ + SO42-+3H2O

5 moles of sulphite ion react with = 2 moles of MnO4-

So, 1 mole of sulphite ion react with =25moles of MnO4-

Difficulty Level:

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