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Q.

INCORRECT statement about lanthanoids in the following is

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a

The separation of Zr and Hf from their mixture is difficult due to lanthanoid contraction

b

In lanthanoids maximum paramagnetism exhibited by Neodymium

c

Samarium being steel hard and melts at 1623 K

d

La+3 and Lu+3 exhibits colour

answer is D.

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Detailed Solution

La (III) has empty f-orbital with no electron, Lu (III) has a completely filled f-orbital with 14 electron. Due to empty and completely filled f-orbital they have no transitions occurring between the electronic energy levels and hence the luminescence is not seen.

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INCORRECT statement about lanthanoids in the following is