1.

The correct order of ionic radii of Y^(3+), La^(3+), Eu^(3+) and Lu^(3+) is (Atomic nos. Y=39 , La = 57, Eu = 63, Lu = 71)

Answer»

`Y^(3+) LT LA^(3+) lt Eu^(3+) lt LU^(3+)`
`Y^(3+) lt Lu^(3+) lt Eu^(3+) lt La^(3+)`
`Lu^(3+) lt Eu^(3+) lt La^(3+) lt Y^(3+)`
`La^(3+) lt Eu^(3+) lt Lu^(3+) lt Y^(3+)`

Answer :B


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