1.

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

Answer»

`Yb^(3+) lt PM^(3+) lt Ce^(3+) lt La^(3+)`
`Ce^(3+) lt Yb^(3+) lt Pm^(3+) lt La^(3+)`
`Yb^(3+) lt Pm^(3+) lt La^(3+) lt Ce^(3+)`
`La^(3+) lt Ce^(3+) lt Yb^(3+) lt Pm^(3+)`

ANSWER :A


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