Some Basic Concepts of Chemistry - Result Question 14

####14. The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is

[2007]

(a) 4/5

(b) 2/5

(c) 1

(d) 3/5

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Solution:

  1. (b) The balance chemical equation is :

2MnO4+6H++5SO322Mn2++5SO42+3H2O

From the equation it is clear that

Moles of MnO4require to oxidise 5 moles of SO32 are 2

Moles of MnO4require to oxidise 1 mole of SO32 are 2/5.



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