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The correct order of ionic radii of Y^(3...

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

A

`Y^(3+) lt La^(3+) lt Eu^(3+) lt Lu^(3+)`

B

`Y^(3+) lt Lu^(3+) lt Eu^(3+) lt La^(3+)`

C

`Lu^(3+) lt Eu^(3+) lt La^(3+) lt Y^(3+)`

D

`La^(3+) lt Eu^(3+) lt Lu^(3+) lt Y^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
B
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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Knowledge Check

  • The correct order of radii is

    A
    `NltBeltB`
    B
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    C
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    D
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  • Which is correct order of ionic mobility?

    A
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    D
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    A
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    B
    `BeCl_(2)ltMgCl_(2)ltBaCl_(2)ltCaCl_(2)`
    C
    `BeCl_(2)ltBaCl_(2)ltMgCl_(2)ltCaCl_(2)`
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