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Which of the following statement is not correct ?
(1) \( \mathrm{La}(\mathrm{OH})_{2} \), is less basic than \( \mathrm{Lu}(\mathrm{OH})_{3} \)
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(2) In lanthanide series, ionic radius of \( \mathrm{Ln}^{3+} \) ions de-
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(3) La is actually an element of transition series rather than lanthanide series
(4) Atomic radii of \( \mathrm{Zr} \) and \( \mathrm{Hf} \) are same because of lanthanide contraction.
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