p-Block elementsHard

Question

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

Options

A.N 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

Solution

Al(OH)3 (amphoteric hydroxide) + OH-  →  [Al(OH)4]- (soluble complex)

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