Q.

Which of the following statement is not correct?

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a

La(OH)3  is  less basic than   Lu(OH)3

b

In lanthanide series ionic radius of Ln3+ * ions decreases

c

La is actually an element of transition series rather than lanthanide series

d

Atomic radii of Zr  and  Hf  are same because of lanthanide contraction

answer is A.

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Detailed Solution

La(OH  )3  is more basic than Lu(OH)3.  This is because ionicsize of La3+ on is more than  La3+  ion (Fajan's rule).
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