p-Block elementsHard

Question

On passing CO2 into aqueous solution containing Al3+ :

Options

A.Al2(CO3)3 is formed
B.Al(OH)3 is precipitated
C.Al2O3 is formed
D.collodial Al(OH)3 is formed

Solution

CO2 + H2O → H2CO3  ⇋ CO32- + 2H+
3CO32- + 3H2O + 2Al3+  → 2Al(OH)3 ↓ (as weakly acidic) + 3CO2.

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