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Chemistry
Which one of the following shows the highest solubility in not conc. aqs. NaOH?
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Q. Which one of the following shows the highest solubility in not conc. aqs. $NaOH$?
The d-and f-Block Elements
A
$La(OH)_3$
50%
B
$Na(OH)_3$
0%
C
$Sm(OH)_3$
0%
D
$Lu(OH)_3$
50%
Solution:
$Lu^{3+}$ is smallest in size, therefore $Lu(OH)_3$ complex most easily formed with $NaOH$ and dissolve.
$ Lu(OH)_3 + 3OH^- \to [Lu(OH)_6]^{3-}$