1.

The correct order of ionic radii of Y^(3+), La^(3+), Eu^(3+) and Lu^(3+) is :

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+)`

Solution :Y is the first MEMBER of 4d-transition series. Its size is less than the size of the lanthanoids. In case of lanthanoids, the size decreases from `La^(3+) to Lu^(3+)`. Therefore, the correct ORDER of ionic RADII is
`Y^(3+) lt Lu^(3+) lt Eu^(3+) lt La^(3+)`


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