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Which of the following statements related to lanthanoid is incorrect?

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All the lanthanoids are much more reactive than aluminium

The ionic radius decreases from Ce⁺³ to Lu⁺³

Europium shows +2 oxidation state

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

answer is C.

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Detailed Solution

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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