Question

The equivalent weight of MnSO₄ is half its molecular weight when it is converted to

(a) Mn₂O₃

(b) MnO₂

(c) MnO^-₄

(d) MnO^2-₄

Answer 1

Correct option (b) MnO₂

Explanation:

Equivalent weight = molecular weight/valency factor

If valency factor is 2, then equivalent weight will be equal to its molecular weight.

In MnSO₄, the oxidation state of Mn is +II

In Mn₂O₃, the oxidation state of Mn is + III

In MnO₂, the oxidation state of Mn is + IV

In MnO^-₄, the oxidation state of Mn is + VII

In MnO^2-₄,  the oxidation state of Mn is  + VI

Thus, when MnSO₄ is converted into MnO₂, then the valency factor is 2, and the equivalent weight of MnSO₄ will be half of its molecular weight.