1.

In the following sets reactants which two sets best exhibits the amphoteric character of Al_(2)O_(3)*xH_(2)O? Set 1: Al_(2)O_(3)*xH_(2)O and OH^(-) Set 2: Al_(2)O_(3)*xH_(2)O and H_(2)O (aq) Set 3:Al_(2)O_(3)*xH_(2)O and H^(+)(aq) Set 4:Al_(2)O_(3)*xH_(2)O and NH_(3)(aq)

Answer»

1 and 2
1 and 3
2 and 4
3 and 4

Solution :Aluminium oxide is AMPHOTERIC oxide becouse it shows the properties of the both basic and ACIDIC oxides. It react with bothe acids and bases to FORM salt and water.
`Al_(2)O_(3)*xH_(2)O+2NaOH to NaAlO_(2)+H_(2)O`
`Al_(2)O_(3)*xH_(2)O+HCl to AlCl_(3)+H_(2)O`


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