Arrange `Ce^(3+),La^(3+), Pm^(3)` and `Yb^(3+)` in increasing order of their size -A. `La^(3+) lt Ce^(3+) lt Pm^(3+) lt Yb^(3+)`B. `Yb^(3+) lt Pm^(3+) lt Ce^(3+) lt La^(3+)`C. `La^(3+) = Ce^(3+) lt Pm^(3+) lt Yb^(3+)`D. `Yb^(3+) lt Pm^(3+) lt La^(3+) lt Ce^(3+)`

Arrange `Ce^(3+),La^(3+), Pm^(3)` and `Yb^(3+)` in increasing order of

1.	Arrange `Ce^(3+),La^(3+), Pm^(3)` and `Yb^(3+)` in increasing order of their size -A. `La^(3+) lt Ce^(3+) lt Pm^(3+) lt Yb^(3+)`B. `Yb^(3+) lt Pm^(3+) lt Ce^(3+) lt La^(3+)`C. `La^(3+) = Ce^(3+) lt Pm^(3+) lt Yb^(3+)`D. `Yb^(3+) lt Pm^(3+) lt La^(3+) lt Ce^(3+)`
Answer» Correct Answer - B For tripositive ions of Lanthanoids size decrease regularly as atomic no. increase due to Lanthanoid contraction.

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Arrange `Ce^(3+),La^(3+), Pm^(3)` and `Yb^(3+)` in increasing order of their size -A. `La^(3+) lt Ce^(3+) lt Pm^(3+) lt Yb^(3+)`B. `Yb^(3+) lt Pm^(3+) lt Ce^(3+) lt La^(3+)`C. `La^(3+) = Ce^(3+) lt Pm^(3+) lt Yb^(3+)`D. `Yb^(3+) lt Pm^(3+) lt La^(3+) lt Ce^(3+)`

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