Name a non-metal that is:

(a) a good conductor of heat and electricity

(b) hardest naturally occurring substance

(c) used to kill germs in water

(d) lustrous

(e) used for filling into electric bulbs

(f) used for cancer therapy

(g) liquid at room temperature

Mention two uses of the following metals and non-metals:

(a) Iron

(b) Aluminium

(c) Gold

(d) Oxygen

(e) Iodine

Give reasons:

Aluminium is used in making aircrafts.

Give reasons:

Copper is used in making electric cables.