Which of the following statements are correct

Options

A. The oxidation number of iodine in orthoperiodic acid `(H_(5) IO _(6)) `is + 7
B. Hydrazine `(N_(2)H_(4))` is a reducing agent. In its reaction with `I_(2)` nitrogen is evolved. The equivalent mass of hydrazine in this reaction is molar mass divided by two.
C. In the reaction `IO _(3) ^(-) + 5 I ^(-) + 6 H ^(+) to 3I_(2) + 3 H _(2) O` the equivalent mass of `IO _(3) ^(-)` is molar mass divided by five.
D. The iodine produced in the reaction `iO _(3) ^(-) + 5 I ^(-) + 6 H ^(+) to 3 I _(2) + 3 H _(2)O` is titrated against `S_(2) O _(3) ^(2-)` ions. Knowing the normality of `S _(2) O _(3) ^(2-),` normality of iodine and hence normality of `IO _(2) ^(-)` is determined. To get the strength of `IO _(3) ^(-)` in `g L^(-1), `the equivalent mass employed for `IO_(3) ^(-)` in `g L^(-1)` would be molar mass divided by four.

Answer

A, C

Explanation

(B) The equivalent mass is molar mass divided by four.
(D) The equivalent mass is molar mass divided by five.