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Question
XCl2 is the chloride of a metal X. State the formula of the sulphate and the hydroxide of the metal X.
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Solution
Chloride of metal X is 
By interchanging subscript and writing as superscript
The valency of metal X is 2
Valency of sulphate SO4 is 2- and of hydroxide OH is 1-
∴ The formula of X2+ `"SO"_4^(2-)`
Sulphate of X = 
⇒ XSO4
The formula of hydroxide of a metal
X2+ OH1- ⇒ 
⇒ `"X"_1 ("OH")_2`
dropping 1 ⇒ X[OH]2
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