1.

Most basic hydroxide among the following isA. `Lu(OH)_(3)`B. `Eu(OH)_(3)`C. `Yb(OH)_(3)`D. `Ce(OH)_(3)`

Answer» Correct Answer - D
Due to lanthanide contraction,the size of `M^(3+)` ion (ie,`Lu^(3+),Eu^(3+),Yb^(3+) and Ce^(3+)`) decreases and thus, the basic strenth of their hydroxides decreases.
The order of size of given `M^(3+)` ions is
`Ce^(3+)gtEu^(3+)gtYb^(3+)gtLu^(3+)`
`therefore` The order of basic strength of hydroxides is
`Ce(OH)_(3)gtEu(OH)_(3)gtYb(OH)_(3)gtLU(OH)_(3)`


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