Comment upon noble metals and use …

Uses of metals:

(i) Lead metal is used in making car batteries.

(ii) Zinc is used for galvanizing iron to protect it from rusting.

(iii) Iron, copper and aluminium are used to make utensils.

(iv) Copper and aluminium metals are used to make wires.

(v) Aluminium is used to make aluminium foil for packaging materials.

Uses of non-metals:

(i) Hydrogen is used in the hydrogenation of vegetable oils.

(ii) Carbon is used to make electrodes of electrolytic cells and dry cells.

(iii) Nitrogen is used in the manufacture of ammonia, nitric acid and fertilizers.

(iv) Sulphur is used in making sulphuric acid.

(v) Liquid hydrogen is used as rocket fuel.

• An alloy is a homogeneous mixture of two or more metals (or a metal and small amount of non-metals) prepared by mixing the various metals in molten state in required proportions, and then cooling their mixture to the room temperature. Alloys do not corrode easily.