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Question

Which of these formulae are incorrect?

A
Ferric oxide - Fe2O3
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B
Ferrous oxide - Fe2O3
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C
Ferric sulphate - Fe(SO4)3
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D
Ferrous sulphate - FeSO4
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Solution

The correct option is B Ferrous oxide - Fe2O3
Ferrous has a valency of 2 and ferric has a valency of 3. Oxide and sulphate have valencies of 2. Hence ferrous oxide should be FeO.

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