question_answer

(i) How many substances are found in coal tar? (ii) Write the uses of coal. (iii) Write the uses of coal tar.

Answer:

(i) Around 200 substances (ii) (a) Coal is used to cook food. (b) It is used in thermal power plants to produce electricity. (c) It is also used as industrial fuel. (iii) (a) It is used a source of various useful substances. (b) It is used to get naphthalene which is used to repel moths and other insects. (c) It is used to make road surface.