Consider the following statement in respect of Lantinanoids : (i) The basic strength of hydroxides of lanthanoids increases from `La (OH)_(3)` to `Lu
Consider the following statement in respect of Lantinanoids :
(i) The basic strength of hydroxides of lanthanoids increases from `La (OH)_(3)` to `Lu (OH)_(3)`.
(ii) The lanthanoid ions `Lu^(3+), Yb^(2+)` and `Ce^(4+)` are diamagnetic.
Which of the statements (s) given above is /are correct ?
A. 1 only
B. 2 only
C. Both 1 and 2
D. neither 1 not 2
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Correct Answer - B
Basic strength decreases from `La(OH)_3` to `Lu(OH)_3`. Hence, (1) is incorrect.
`Ce=[Xe] 4f^1 5d^1 6s^2, Ce^(4+)=[Xe]`
`Yb =[Xe]4f^14 6s^2, Yb^(2+)=[Xe] 4f^14`
`Lu=[Xe] 4f^14 5d^1 6s^2, Lu^(3+)=[Xe]4f^14`
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