NEET Solved Paper 2018 Question 37
Question: For the redox reaction $ MnO_4^{-}+C _2O_4^{2-}+{H^{+}}\xrightarrow{{}}M{n^{2+}}+CO _2+H _2O $ . The correct coefficients of the reactants for the balanced equation are [NEET - 2018]
Options:
A) $ MnO_4^{-} $ $ {C_2}O_4^{\text{2-}} $ $ {H^{+}} $ 2 16 5
B) $ MnO_4^{-} $ $ {C_2}O_4^{\text{2-}} $ $ {H^{+}} $ 2 5 16
C) $ MnO_4^{-} $ $ {C_2}O_4^{\text{2-}} $ $ {H^{+}} $ 16 5 2
D) $ MnO_4^{-} $ $ {C_2}O_4^{\text{2-}} $ $ {H^{+}} $ 5 16 2
Show Answer
Answer:
Correct Answer: B
Solution:
n-factor of $ MnO_4^{-}\Rightarrow 5 $ n-factor of $ C _2O_4^{2-}\Rightarrow 2 $
Ratio of n-factors of $ MnO_4^{-} $ and $ {C_2}O_4^{\text{2-}} $ is $ \text{5:2} $
So, molar ratio in balanced reaction is $ 2:5 $
$ \therefore $ The balanced equation is $ 2MnO_4^{-}\text{+5}{C_2}O_4^{\text{2-}}\text{+16}{H^{+}}\to 2M{n^{\text{2+}}}\text{+10C}{O_2}\text{+8}{H_2}O $
