When oxalic acid dihydrate, H2C2O4.2H2O (molar mass 126), is titrated against acidified KMnO4, its equivalent mass is:

NEET levelSingle correct optionDifficulty 1 of 3rx168

When oxalic acid dihydrate, $H X_{2} C X_{2} O X_{4} \cdot 2 H X_{2} O$ (molar mass 126), is titrated against acidified $KMnO X_{4}$ , its equivalent mass is:

Oxalate is oxidised to

CO X_{2}

: each carbon goes from +3 to +4, so n-factor = 2 per molecule. Equivalent mass = 126/2 = 63. The value 45 would be for the anhydrous acid (90/2).