Meq of oxalic acid =Meq of KMnO4
V*0.1=250*8/100*3L6*1000=6.3 litres.How mass is equivalent equal is it a formula??
Equivalent mass is the mass of one equivalent of any substance.
Mathematically, it is calculated as follows.
This question if from the concept of titration and in titration molar equivalent mass is equal in the equivalence point.
Hence, the correct option is (a).