The formula of the chloride of a metal is `MCl_(2)`. What will be the formula of its sulphate.

Explanation

(i) First of all we have to find out the valency of metal M from the formula of its ionic chloride `MCl_(2)`. Now, we know that the valency of chlorine (Cl) is 1. Since one atom of M has `2Cl` atom s attached to it, so the valency of M is `2` or `2+`.
(ii) The formula of sulphate of metal M of valency 2 can be found as follows :

Thus, the formula of sulphate of metal M will be ` MSO_(4)`.
(The metal M of valency of 2 is like magnesium, so the chloride `MCl_(2)` is like magnesium chloride, `MgCl_(2)`, and the sulphate `MSO_(4)` is like mangesium sulphate, ` MgSO_(4)`).
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