Which of the following option is the correct order of the basic strength of metallic hydroxides

Options

A. `Al(OH)_3 lt Lu(OH)_3 lt Ce(OH)_3 lt Ca(OH)_2`
B. `Ca(OH)_2 lt Al(OH)_3 lt Lu(OH)_3 lt Ce(OH)_3`
C. `Lu(OH)_3 lt Ce(OH)_3 lt Al(OH)_3 lt Ca(OH)_2`
D. `Cu(OH)_3 lt Ce(OH)_3 lt Ca(OH)_2 lt Al(OH)_3`

Answer

A

Explanation

`Ca(OH)_2` is highly basic and`Al(OH)_3` is amphoteric. As we move left to right in a period, the basicity of hydroxides decreases. So the basic character of `Ce(OH)_3 gt Lu(OH)_3`.