Coal tar is obtained from the processing of coal. It can easily take up variety of colours. It is a thick viscous substance and thus, is useful for making paints, dyes, etc. 

The process of heating coal in the absence of air does not lead to the burning of coal, but forms many by-products. This process is called destructive distillation of coal. The main by-products of destructive distillation are: coke, coal tar, amino acid liquor and coal gas.

Coke is used as a fuel and a reducing agent in smelting of iron ore in a blast furnace. In this process, iron oxide (haematite) is reduced to collect iron.

Gross Calorific Value (GCV (kJ/kg)) Anthracite: 32500 - 34000 Lignite: 16300 Bituminous coal: 17000 - 23250 Peat: 13800 - 20500

Fertiliser manufacturing industries use ammoniacal liquor, which is a by-product of coal tar, which in turn is obtained during the destructive distillation of coal. All other products are manufactured with the use of petroleum constituents.

Haematite is an iron ore, not a stage during formation of coal.

Natural gas is used in the production of fertilisers.

Petroleum conservation research association

Coke is not obtained from petroleum.

The process of separating various fractions of petroleum.

Coke, coal tar and coal gas are the useful products of coal.

CNG is a clean fuel, it can be supplied through pipes and it is used in power generation.

Ensure correct tyre pressure and drive at constant or moderate speed as far as possible. Get the vehicle serviced and maintained regularly. To save fuel, the engine should be turned off at traffic lights where you have to wait for sometime.

At high temperature and pressure, the dead plants and animals get decomposed slowly and are converted into coal.

Bitumen is used for paints and kerosene is used for lamps.