Dear Student, a) Some metal oxides show both acidic and basic behaviour The metal oxides which react with both acids and bases to produce salt and water are known as Amphoteric Oxides As aluminium oxide reacts with both acids and bases and produces salts and water, therefore aluminium oxide is considered as Amphoteric Oxide Equations- (1)Al2O3 + 6HCl ==> 2AlCl3 + 3H2O (2)Al2O3 + 2NaOH ==> 2NaAlOâ€‹2 + H2O b) In ionic compounds, electricity is conducted by ions In solid state, ions are held together by strong electrostatic forces and are not free to move about within the solid Hence, ionic solids do not conduct electricity in solid state However, in molten state or in solution form, the ions are free to move and can conduct electricity Regards

Please answer q 10.....

Dear Student,

a) Some metal oxides show both acidic and basic behaviour. The metal oxides which react with both acids and bases to produce salt and water are known as Amphoteric Oxides.

As aluminium oxide reacts with both acids and bases and produces salts and water, therefore aluminium oxide is considered as Amphoteric Oxide.

Equations-

(1)Al2O3 + 6HCl ==> 2AlCl3 + 3H2O

(2)Al2O3 + 2NaOH ==> 2NaAlO2 + H2O

b) In ionic compounds, electricity is conducted by ions. In solid state, ions are held together by strong electrostatic forces and are not free to move about within the solid. Hence, ionic solids do not conduct electricity in solid state. However, in molten state or in solution form, the ions are free to move and can conduct electricity.

Regards

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