1.

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

Answer»

`Yb^(3+) lt P m^(3+) lt CE^(3+) ltLa^(3+)`
`Ce^(3+) lt Yb^(3+) lt P m^(3+) lt Ce^(2+)`
`Yb^(3+) lt P m^(3+) lt LA^(3+) lt Ce^(2+)`
`P m^(3+) lt La^(3+) lt Ce^(3+) lt Yb^(3+)`

Answer :A


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