KMnO4 reacts with oxalic acid according to the equation2MnO4- +5C2O4^2- +16OH- -2MnO2+ + 10CO2 + 8H20here 20 mL of 0.1 M KMnO4 is equivalent to.....

1. 50mL of 0.5 M C2H2O4

2. 20 mL of 0.1 M C2H2O4

3. 20 mL of 0.5 M C2H2O4

4. 50 mL of O.1 M C2H2O4

 

Now,

Normality = molarity x change in oxidation number

So,

And

Also

Number of milli equivalents (meq)= Normality x volume in ml

 

Therefore,

And

 

Hence, 20 mL of 0.1 M KMnO4 is equivalent to 50 mL of 0.1 M C2H2O4

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use the formula no. of moles of A X n-factor=no.of moles of B X n-factor

or try to equate the no. of moles from the above reaction

or use M1V1/M2V2=n1/n2

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