Mention one reason for the use of aluminium in thermite welding.

Give uses of aluminium, copper and zinc.

Choose the correct answer from the options A,B,C & D given : The reason for using aluminium in the alloy duralumin is :

Mention one use of hydrazine.

Mention the important uses of chlorine

Mention three reasons for the increase in population in India.

Choose the correct answer from the choices : Aluminium powder is used in thermite welding because