Which of these formulae are incorrect?

Ferric oxide -

F e_{2} O_{3}

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Ferrous oxide -

F e_{2} O_{3}

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Ferric sulphate -

F e (S O_{4})_{3}

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Ferrous sulphate -

F e S O_{4}

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Solution

The correct option is B Ferrous oxide - $F e_{2} O_{3}$
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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