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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. (i) onlyB. (ii) onlyC. Both (i) and (ii)D. Neither (i) nor (ii) |
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Answer» Correct Answer - B (i) basic strength decrease from `La (OH)` to `Lu (OH)_(3)` because moving from left to right `Z_("eff")` increases so size of `M^(+3)` cation decreases, covalent character increases so basic strength decreases between `M^(+3)` and `OH^(-)` ion. (ii) `Lu^(3+) . Yb^(2+)` have `f^(14)` electronic configuration and `Ce^(4+)` has `f^(0)` electronic configuration so they are diamagnetic. |
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