an element y forems an oxide whose chemical formulae is Y2 O3
(a) state the valency of Y
(b) write the chemical formulae of it's:(a) Sulphate and (b) chloride?
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The valency of Y is 3, the formula of its sulphate is Y₂(SO₄)₃ and the formula for its chloride is YCl₃.
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