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Arrange (I)Cr^(3+),(II)La^(3+),(III)Pm^(...

Arrange `(I)Cr^(3+),(II)La^(3+),(III)Pm^(3+)` and `(IV)Yb^(3+)` in increasing order of their ionic radii.

A

`IVltIIIltIltII`

B

`IltIVltIIIltII`

C

`IVltIIIltIIltI`

D

`IIIltIIltIltIV`

Text Solution

Verified by Experts

The correct Answer is:
a
Ionic radii decrease across lanthanide series due to lanthanide contraction. As all ions are in `+3` O.S. ionic radii will follow the trend of atomic radii.
`La^(3+)gtCe^(3+)gtPm^(3+)gtYb^(3+)`
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