The process of heating coal in the absence of air is called the destructive distallation of coal. Coal contains a number of elements such as carbon, hydrogen, oxygen, nitrogen and sulphur. When coal is heated in the absence of air, a number of products are obtained. A laboratory set up to carry out destructive distillation of coal as shown.

Read the below questions and try to answer them.
Name the purest of coal.

Explanation

Coke contains 98% carbon which is porous, tough, black and the purest form of coal.