[All the lanthanons are mu...] Which one of the following statements related to lanthanons is incorrect?

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Which one of the following statements related to lanthanons is incorrect?

Ce (+4) solutions are widely used as oxidizing agent in volumetric analysis.

Europium shows +2 oxidation state.

The basicity decreases as the ionic radius decreases from Pr to Lu.

All the lanthanons are much more reactive than aluminium.

Explanation:

Ce⁺⁴ is strong oxidising agent and easily convert into Ce⁺³

Eu⁺² exist and behave as reducing agent.

Ln(OH)₃ are basic in nature and as ionic radius decrease, basic nature decreases from Ce to Lu.

Whether all lanthanons are much more reactive than aluminum can’t be said.

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