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

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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All the lanthaides 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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Solution

The correct option is C All the lanthaides 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 behavior becomes similar to that of aluminium.

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