D-And F-Block Elements Ques 256
Question: The number of moles of $ KMnO_4 $ that will be needed to react completely with one mole of ferrous oxalate $ Fe(C_2O_4) $ in acidic solution is
[IIT-JEE 1997; KCET 1996]
Options:
A) 3/5
B) 2/5
C) 4/5
D) 1
Show Answer
Answer:
Correct Answer: A
Solution:
$ \underset{3M}{\mathop{3MnO_4^{-}}},+\underset{5M}{\mathop{5(F{{e}^{2+}}+C_2O_4^{2-})}},+24{{H}^{+}}\to $ $ 3Mn^{2}+5F{{e}^{3+}}+10CO_2+12H_2O $
Thus 5M of $ FeC_2O_4 $ is oxidised by 3M of $ KMnO_4 $
then 1M of $ FeC_2O_4 $ is oxidised by 3/5 mole of $ KMnO_4 $ .
