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

D

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

Text Solution

Verified by Experts

The correct Answer is:
C
`Al(OH)_(3)+OH^(-) overset(NaOH)rarr [Al(OH)_(4)]^(-)`
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