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Aqueous ammonia is used as a precipitating reagent for Al3+ ions as Al(OH)3 rather than aqueous NaOH, because: 

(A) NH4+ 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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(C) NaOH forms [Al(OH)4- ions

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