Give scientific reasons for: Zinc oxide can be reduced to zinc by using carbon monoxide, but aluminium oxide cannot be reduced by a reducing agent.

State the main components of the following alloys :

(i) Brass

(ii) Duralumin

(iii) Bronze.

From the oxides — SO₂, SiO₂, Al₂O₃, MgO, CO, Na₂O — Select

(i) A basic oxide

(ii) An amphoteric oxide.

Name the following :

(i) The property possessed by metals by which they can be beaten into sheets.

(ii) A compound added to lower the fusion temperature of electrolytic bath in the extraction of aluminium.

(iii) The ore of zinc containing its sulphide.