Just check my answers no need of explanation. For wrong answer pl explain. Chapter - coal and petroleum


The answer to all the questions is absolutely correct.

4) Petroleum is called black gold because when crude oil is extracted from the land it is black in color. People called it gold because of its commercial importance.

Hence, the correct option is (a).

5) Coal, petroleum, and natural gas cannot be created in the laboratory, a slow process creates them over a long period of time.

Hence, the correct option is (d).


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