This video lecture from Group IIIA and Group IVA Elements (F.Sc. second year Chemistry) covers the physical properties and uses of Silicones. These are polymeric compounds of silicon having Si-O linear chains with alkyl groups on either sides of silicon. Their hardness is a function of chain length. They exist as pastes, hard plastics and even as liquid oils used for lubrication. They are water repellent and find use in textile industry, medicine, household appliances, automobile and aircraft industry, kitchen appliances and space applications. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.