Q.

2 mole, equimolar mixture of Na2C2O4 and H2C2O4 required V1L of 0.1 M KMnO4 in acidic medium for complete oxidation. The same amount of the mixture required V2L of 0.2 M NaOH for neutralization. The ratio of V1 to V2 is:

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a

1:2

b

2:1

c

4:5

d

5:4

answer is C.

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Detailed Solution

2 mole, equimolar mixture of Na2​C2O4 and H2C2O4​ required V1​L of 0.1M KMnO4 in acidic medium.

As the mixture is equimolar, 1 mole of each, Na2​C2O4 and H2​C2O4​ are present.

eq. of Na2C2O4+eq.of H2C2O4  = eq. of KMnO4

1x2+1x2= V1x0.1x5 ; (n-factor of KMnO4=5 , n-factor of Na2C2O4=n-factor of H2C2O4=2)

  V1=8L
eq.of H2C2O4= eq.of NaOH
1x2 =0.2 x V2; V2=10L
Hence, V1:V2=8:10=4:5

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