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  • What are consequences of Lanthanide Contraction ?Option: 1 Size of the atom of third transition series is nearly the same as that of the atoms of the

What are consequences of Lanthanide Contraction ?

Option: 1

Size of the atom of third transition series is nearly the same as that of the atoms of the second transition series


Option: 2

Difficulty in the separation of lanthanides


Option: 3

The covalent character of the hydroxides increases on moving from left to right in the lanthanide series and hence their basic strength decreases


Option: 4

All of the above


Answers (1)

best_answer

Screening Effect and Lanthanoid Contraction -

Atomic size: Size of the atom of third transition series is nearly the same as that of the atom of the second transition series. For example: radius of Zr = radius of Hf & radius of Nb = radius of Ta etc.

Difficulty in the separation of lanthanides: As there is an only small change in the ionic radii of Lanthanides, their chemical properties are similar. This makes the separation of elements in the pure state difficult.

Effect on the basic strength of hydroxides: As the size of lanthanides decreases from La to Lu, the covant character of the hydroxides increases and hence their basic strength decreases. Thus, La (OH)3 is more basic and Lu(OH)3 is the least basic.

Therefore,  option (4) is correct.

Posted by

seema garhwal

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