Question

The number of moles of KMnO₄ that will be required to react with one ole of sulphide ion in acidic medium is
a) 2/4
b) 3/5
c) 4/5
d) 5/5

Answer 1

As per chemical equation

2MnO4- + 5S03 2- ->5S04 2- +2Mn2+

Therefore 2/5 is your answer

@skb

Answer 2

Sol. The balanced chemical reaction is :

2MnO_4^- + 5CO_4^(2-) + 16H+

→ 2Mn2+ + 5SO_4^(2-) + 3H2O

∵ 5 moles SO_4^(2-) reacts with 2 moles of KMnO4

∴ 1 mole SO_4^(2-) reacts with 2/4 mole of KMnO4.

Hope it exact answer for the student to get better ideas with out meeting any trouble of it