Coal tar

It is a black coloured thick liquid with an unpleasant smell. It is a mixture of about 200 substances. Products obtained from the coal tar are used as starting material for manufacture of various substances like synthetic dyes, drugs, explosives, perfumes, plastics, paints, and roofing materials etc. Interestingly naphthalene balls used to repel moths and other insects are also obtained from coal tar.

Coal gas

Coal gas is obtained during the processing of coal to get coke. It is used as a fuel in many industries situated near the coal processing unit.

Activity-4

Identifying uses of coal products.

Observe the figure-3 and list out the uses of coal products in the following table-5.You can collect more information by discussion with elders and with your friends.

Aim:To show that when we heat high quality coal (carbon content is more) the evolved gas burns.

Material required: Two boiling tubes, Rubber corks,iron stands, delivery tube, jet tube, Bunsen burner.

Procedure:Take a spoon of powdered coal into a hard boiling tube and fix it to a stand as shown in the figure. Close the test tube with a rubber cork and connect it to another boiling tube which is partially filled with water and has fixed to other stand, with the help of ‘U’ shaped delivery tube as shown in the figure. Arrange a jet tube to the cork of second boiling tube. Heat the boiling tube containing coal strongly with the help of Bunsen burner.