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 $ .



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