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

All the lanthanons are much more reactive than aluminium.

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

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Europium shows +2 oxidation state.

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

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Solution

The correct option is A All the lanthanons are much more reactive than aluminium.
The first few members of the lanthanoid series are quite reactive, almost like calcium. However, with increasing atomic number their behaviour becomes similar to that of aluminium metal.

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