An element ‘Y’ forms an oxide whose chemical formulae is Y 2 O 3
a) State the valency of Y.
b) Write the chemical formulae of its: (a) Sulphate and (b) Chloride?
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Its valency is 1. Therefore, 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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