Which one of the following statements related to lanthanons is incorrect? (NEET 2016) (a) \( \ma...

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Which one of the following statements related to lanthanons is incorrect?
(NEET 2016)
(a) \( \mathrm{Ce}(+4) \) solutions are widely used as oxidizing agent in volumetric analysis
\( \mathrm{P} \)
(b) Europium shows \( +2 \) oxidation state
(c) The basicity decreases as the ionic radius decreases from Pt to Lu
W.
(d) All the lanthanons are much more reactive than aluminium
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