Question

The formula of the chloride of a metal is mcl2. What will be the formula of its sulphate

Answer 1

MSO4

Valency of m - 2

Valency of sulphate - 2

M2(SO4)2

The valencies will be cut

The formula will be - MSO4

Answer 2

Answer: The formula for its sulfate will be $MSO_4$

Explanation:

It is given that the formula of a metal chloride is $MCl_2$

The oxidation state of chlorine is -1 and the oxidation state of metal ion will be +2. This is so because in criss cross method, a chemical formula for compounds is written by exchanging of valencies or oxidation state of the ions which form the subscripts of the formula.

Sulfate is a polyatomic ion which has a chemical formula $SO_4^{2-}$. The oxidation state of this ion is -2.

And we know that the oxidation state of metal ion is +2. So, by criss cross method, the chemical formula for this compound will be $MSO_4$