1.

Arrange `Ce^(3+),La^(3+), Pm^(3)` and `Yb^(3+)` in increasing order of their size -A. `Yb^(3+)ltPm^(3+)ltCe^(3+)ltLa^(3+)`B. `Ce^(3+)gtYb^(3+)ltPm^(3+)La^(3+)`C. `Yb^(3+)Pm^(3+)ltLa^(3+)ltCe^(3+)`D. `Pm^(3+)ltLa^(3+)ltCe^(3+)ltYb^(3+)`

Answer» Correct Answer - A
Due to lanthnide contraction left to right ionic size decreases.


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