What is coal and also write its uses?
Coal is a tough, porous and black substance. It is almost pure form of carbon. It is formed by the dead remains of the living organisms.
Uses of coal:
(i) Coal is used as fuel to cook food.
(ii) It is used to run trains, as it is burnt to generate steam in engine.
(iii) It is used in thermal power plants to produce electricity.
(iv) Coal is also used as fuel in different industries.
What is coke? How is it useful to us?
Coke is a tough, porous and black substance. It is almost pure form of carbon.It is obtained by destructive distillation of coke. It is almost pure form of carbon.
(i) Coke is used to manufacture steel.
(ii) It is used in extraction of many metals.
Which constituents are separated from petroleum during the refining of petroluem?
Petroleum gas, petrol, diesel, lubricating oil, paraffin wax, etc. can be separated from petroleum.
What is coal-tar? How is it useful to us?
Black liquid obtained during destructive distillation of coal is coal-tar. It is thick and smells unpleasant. It is a mixture of hundreds of substances. Substances obtained from coal-tar are used to manufacture synthetic dyes, drugs, explosives, perfumes, plastics, paints, roofing materials, photographic materials, etc.