1.

Correct order of ionic Radii is :-

Answer»

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

Answer :C


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