Which of these formulae is/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 options are
B
Ferrous oxide - $F e_{2} O_{3}$

C
Ferric sulphate - $F e (S O_{4})_{3}$

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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