Question

How many moles of acidified $FeSO_4$ solution canbe completely oxidised by one mole of $KMnO_4$ ?

• A. 10
• B. 5
• C. 6
• D. 2

Answer 1

Answer: (B)

5

Answer 2

The equation for the reaction of KMNO4 with FeSO4 in the acidic medium

2KMnO4 + 10FeSO4 + 8H2SO4 $\to$ 5Fe2(SO4)3 + 2MnSO4 +K2SO4 +K2SO4 +8H2O

With the help of the equation, it is observed that 2 moles of KMnO4 will react with 10 moles of FeSO4.
Therefore, the unitary method for one mole of KnMO4 will react with 5 moles of FeSO4.

So, the correct answer (B): 5