The given figure represents destructive distillation of coal. Destructive distillation is the strong heating of a substance in the absence of air.

Which of the following is the correct statement?

Options

A. Coal tar is an almost pure form of carbon.
B. On heating, coal produces mainly nitrogen dioxide gas.
C. Coke is not used in the manufacture of steel and in the extraction of many metals.
D. Coal gas was used for street lighting.

Answer

D

Explanation

Coke is an almost pure form of carbon. On heating, coal mainly produces carbon dioxide gas. Coke is used in the manufacture of steel and in the extraction of many metals.