Question

Which mineral is called liquid gold?
A. Coal
B. Gold
C. Petroleum
D. Iron

Answer 1

Hint:
It refers to a fossil fuel, which means that it has been made by the decomposition of organic matter over millions of years. It generally has naturally occurring hydrocarbons of various molecular weights and may also contain miscellaneous organic compounds.

Complete solution:
Petroleum which is also known as crude oil or just oil, is a naturally occurring, yellowish-black liquid found in geological formations under the surface of the Earth.
Petroleum is called 'Liquid Gold' since it is liquid and just like gold, it has a high commercial value. It is generally called so in order to imply its significance.

 It also serves directly or indirectly as a source for various organic products that are useful and essential for humans. It is expensive and difficult to find, like gold.

Also, Crude oil or petroleum is originally jet black in colour before purification but after purification, it changes golden in color; therefore, it is commonly tagged as Gold. It is majorly used in manufacturing various products like pharmaceuticals, plastics, gasoline, synthetic fabrics, etc so it is called black gold. But because of its oil and worth, people refer to it as gold.

Hence, the correct answer is option C.

Note:
Petroleum is commonly refined into several types of fuels. Components of petroleum are separated using a technique known as fractional distillation, which means separation of a liquid mixture into fractions that should be differing in boiling point by means of distillation, particularly using a fractionating column.