Aqueous ammonia is used as a precipitati...

Aqueous ammonia is used as a precipitating reagent for `Al^(3+)` ions as `Al(OH)_(3)` rather than aqueous `NaOH`, because:

A

`NH_(4)^(+)` is a weak base

B

`NaOH` is a very strong base

C

`NaOH` forms `[Al(OH)_(4)]^(-)` ions

D

`NaOH` forms `[Al(OH)_(2)]^(+)` ions.

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The correct Answer is:

C

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