Which of the following statements are correct?

Options

A. The equivalent mass of `KMnO_(4)` in strongly alkaline medium is equal to its molar mass.
B. The equivalent mass of `S_(4) O _(3) ^(2-)` in its reaction with `I_(2),` is molar mass divided by two.
C. A solution of cerium (IV) in sulphuric acid acts as an oxidizing reagent.
D. The equivalent mass of `K_(2) Cr_(2) O_(7)` in acidic medium'is molar divided by five.

Answer

A, C

Explanation

(A) In strongly alkaline medium , `MnO _(4) ^(-)` undergoes the reaction `MnO _(4) ^(-) + e ^(-) to Mn O _(4) ^(2-).` Hence , its equivalent mass is equal to its molar mass.
(B) The reaction is `2S _(2) O _(3) ^(2-) to S _(4) O _(6) ^(2-) + 2e ^(-).` Hence, Equivalent mass `=(2 xx "Molar mass")/(2) = ` molar mass
(C) The reaction is `Ce ^(+) + e ^(-) to Ce ^(3+)`
(D) The reaction is `Cr _(2) O _(7) ^(2-) + 14 H ^(+) + 6e ^(-) to 2Cr ^(3+) + 7 H _(2) O.` Equivalent mass = molar mass /6 eq `mol^(-1)`