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pH of a saturated solution of Al(OH)3, i...

pH of a saturated solution of `Al(OH)_3`, is 9. The value of solubility product `(K_sp)` of `AlCl_3` is

A

`1/2*1^-20`

B

`1/3*1^-20`

C

`1/3*1^-15`

D

`1/4*1^-15`

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