Question
In acidic medium, $$KMn{O_4}$$ oxidises $$FeS{O_4}$$ solution. Which of the following statements is correct?
A.
$$10\,mL$$ of $$1\,N\,KMn{O_4}$$ solution oxidises $$10\,mL$$ of $$5\,N\,FeS{O_4}$$ solution.
B.
$$10\,mL$$ of $$1\,M\,KMn{O_4}$$ solution oxidises $$10\,mL$$ of $$5\,M\,FeS{O_4}$$ solution.
C.
$$10\,mL$$ of $$1\,M\,KMn{O_4}$$ solution oxidises $$10\,mL$$ of $$1\,M\,FeS{O_4}$$ solution.
D.
$$10\,mL$$ of $$1\,N\,KMn{O_4}$$ solution oxidises $$10\,mL$$ of $$0.1\,M\,FeS{O_4}$$ solution.
Answer :
$$10\,mL$$ of $$1\,M\,KMn{O_4}$$ solution oxidises $$10\,mL$$ of $$5\,M\,FeS{O_4}$$ solution.
Solution :
$$2KMn{O_4} + 8{H_2}S{O_4} + 10FeS{O_4} \to $$ $${K_2}S{O_4} + 2MnS{O_4} + 5F{e_2}{\left( {S{O_4}} \right)_3}$$ $$ + 8{H_2}O$$
One mole of $$KMn{O_4}$$ oxidises five moles of $$FeS{O_4}$$ i.e., $$1\,M\,KMn{O_4}$$ can oxidise equal amount of $$5\,M\,FeS{O_4}.$$