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Iron commonly occurs in the +2 and +3 oxidation states. Which statement about iron compounds is NOT correct?

1. Ferrous compounds hydrolyse more readily than the corresponding ferric compounds.
2. Ferrous oxide is more basic than ferric oxide.
3. Ferrous compounds are relatively more ionic than the corresponding ferric compounds.
4. Ferrous compounds are less volatile than the corresponding ferric compounds.

Correct answer: Ferrous compounds hydrolyse more readily than the corresponding ferric compounds.

Solution

Fe3+ has a higher charge and smaller size, so it is more polarising; ferric compounds are more covalent, more volatile and hydrolyse more readily than ferrous compounds. Hence the statement that ferrous compounds hydrolyse more easily is incorrect.

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