Question

Choose the incorrect statement among the following.
A.Many useful substances are obtained from petroleum and natural gas. These are termed ‘petrochemicals’.
B.Hydrogen gas obtained from natural gas is used in the production of fertilizers.
C.Due to the great commercial importance of petroleum, it is also called ‘black gold’.
D.Natural gas is stored under low pressure as compressed natural gas (CNG).

Answer 1

The natural resources obtained from nature that are used as fuels are called Fossil fuels. Petroleum and Natural gas are ‘Exhaustible Natural resources’, that is they are present in limited quantities in nature. Natural gas is stored as either Compressed Natural Gas (CNG) or Liquefied Petroleum Gas (LPG).

Complete answer:
To get the correct answer we have to verify all given options/statements. By understanding each statement, we can find out which option is the incorrect statement.
Let’s verify the statements one by one:
Option A: Petroleum is a dark oily sticky liquid obtained from below the earth's surface. It is derived from two words petra meaning rock and oleum that means oil. It consists of various components like petrol, diesel, petroleum gas (natural gas), paraffin wax, lubricants, etc. many useful substances that are obtained from petroleum and natural gas and are known as ‘Petrochemicals’. Thus, Statement A is correct.
Option B: Natural gas consists of hydrocarbons. Hydrocarbons have Hydrogen as the major constituent. The hydrogen gas obtained from Natural gas is used to make plant fertilizers. Hydrogen derived from Petroleum gas is utilized to manufacture Urea. Thus, Statement B is correct.
Option C: The petroleum procured from the Earth in the form of crude oil is black. Also, the value of petroleum is high just like gold. Relating to the similarity between gold and petroleum and its high commercial importance, it is correctly referred to as ‘Black gold’. Thus, Statement C is correct.
Option D: Natural gas is compressed to make CNG. It is mainly constituted of methane which is stored under high pressure. The pressure at which CNG is stored is 20-25 MPa and distributed in hard containers. Thus, Statement D is incorrect.
Therefore, the final answer is Option D.

Note:
We should note that CNG is stored under high pressure so that it can be transported through pipelines to different places from the manufacturing unit. Due to more pressure, it covers less volume than ordinary natural gas. Also, do not confuse CNG with LPG, the latter being the liquefied version of the natural gas at low pressure.