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The formula of copper sulphate is CuSO4. What is the valency of copper, if the valency of SO4 is 2?

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The formula of copper sulphate is CuSO4. What is the valency of copper, if the valency of SO4 is 2?

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This formula suggests that one molecule of copper sulphate contains, an equal number of copper and sulphate ions. Since the valency of the sulphate ion has been given as 2, hence, the copper ion must be of charge 2

∴ Valency of copper is 2.

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