1.

Which of the following is more basic hydroxide ?

Answer»

`Sm (OH)_(3)`
`Yb(OH)_(3)`
`Ho(OH)_(3)`
`Ho_(OH)_(3)`

Solution :ACCORDING to FAJAN's rule larger the size of the cation, GRATER is the tendency of its hydroxides to dissociate and stronger will be the base. All lanthanides FORM hydroxide of formula `Ln(OH)_(3)` and oxides. Which are ionic and basic in NATURE. From `La^(3+) ` to `Lu^(3+)` ionic size decreases, as a result, their covalent character between `Ln^(3+)`ion and `OH^(-)` ion increases, Therefore `La(OH)_(3)` is more basic and more ionic than `Lu(OH)_(3).`
Basicity and ionic character of hydroxide decrease in the order.
`La(OH)_(3)gt Ce (OH)_(3)gt ......gt Lu(OH)_(3)`


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