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The incorrect statement for lanthanides among the following statements is :

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Some lanthanide ions absorb colour either in infrared or ultraviolet region of electromagnetic spectrum

Most common stable oxidation state is +3

4f and 5d orbitals are so close in energy that it is very difficult to locate the exact position of electrons m lanthanides

Trepositive lanthanide ions have characteristic colour depending on nature of group with which they combine to form compounds

answer is C.

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Detailed Solution

Trepositive lanthanide ions have characteristic colour does not depending on nature of group with which they combine to form compounds.

Because all lanthanide ions show absorptions in the visible or near UV region of the spectrum.

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