Most basic hydroxide among the following is

Options

A. `Lu(OH)_(3)`
B. `Eu(OH)_(3)`
C. `Yb(OH)_(3)`
D. `Ce(OH)_(3)`

Answer

D

Explanation

Due to lanthanide contraction , the size of `M^(3+)` ions `[ie, Lu^(3+), Eu^(3+),Yb^(3+) and Ce^(3+)]` decrease and thus , the basic strength of their hydroxides decreases .
The order of size of given `M^(3+)` ions is
`Ce^(3+) gt Eu^(3+) gt Yb^(3+) gt Lu^(3+)`
`:. ` The order of basic strength of hydroxide is ` underset("(most basic)")(Ce(OH)_(3)) gt Eu(OH)_(3) gt Yb(OH)_(3) gt Lu(OH)_(3)`