s-Block ElementsHard

Question

If NaOH is added to an aqueous solution of Al3+ ions, a white precipitate appears and on adding excess of NaOH, the precipitate dissolves. In the solution, aluminium exists in the :

Options

A.anionic part
B.cationic part
C.both in anionic and cationic part
D.colloidal form

Solution

Al3+ + 4OH- (from NaOH) →  [Al(OH)4]-
So aluminium exists in the anionic part.

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