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Variable Valency

an element M ...

Question

an element M burnes in oxygen to form its oxide having the formula M2O3.find valency of the element.write the formulae of its sulphate and bromine

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Solution

Valency of M = 3
Valency of O = 2

Formula for sulphate is M₂(SO₄)₃.
Formula for bromide is MBr₃

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