Carbon and Fossil Fuels

The sentence needs a relative clause to describe the "sedimentary rock". Since oil and natural gas are obtained from the rock, the relative pronoun "which" must be preceded by the preposition "from", yielding "from which". Other options fail to provide the correct prepositional relationship or introduce unnecessary verbs.

Wood is a biofuel obtained from recently living trees, making it a renewable resource. Coal, oil, and natural gas are fossil fuels formed over millions of years from the remains of ancient plants and organisms.

Both natural gas and coal are fossil fuels, but they differ in their physical state and origin. Natural gas is a gaseous hydrocarbon often grouped under petroleum resources, whereas coal is a solid carbon-rich rock extracted from underground coal deposits. The other options incorrectly classify either natural gas or coal as renewable resources.

Petroleum is frequently referred to as liquid gold due to its immense economic value and importance in the global economy.

Petrol (gasoline) is a refined product of petroleum and is widely used as a fuel for internal combustion engines in motor vehicles.

CNG (Compressed Natural Gas) is considered a cleaner fuel compared to petrol, diesel, or coal because it produces fewer harmful emissions, such as carbon monoxide and particulate matter.

Fossil fuels are generally categorized into three main types: coal, petroleum (oil), and natural gas.

PCRA is the Petroleum Conservation Research Association, an Indian government organization established in 1978 to promote energy efficiency and conservation in the petroleum sector. Note: correct spelling is 'Petroleum' not 'Petrolium'.

Petrol and diesel are both refined products obtained from crude oil, which is petroleum. Therefore, the statement that they are not obtained from petroleum is false.

Carbonisation is the slow process by which vegetation (like wood) is converted into coal under high pressure and temperature over millions of years.

Diesel is a fuel derived from petroleum, which is a fossil fuel. Therefore, the statement that diesel is not a fossil fuel is false.

Natural gas, coal, and petroleum are all fossil fuels. They are formed over millions of years and exist in limited quantities, making them exhaustible.

LPG stands for Liquified Petroleum Gas, not Liquid Petroleum Gas. The term 'Liquified' is more accurate because the gas is compressed and cooled to convert it into liquid form for storage and transportation.

Coke is a tough, porous, and black substance that is an almost pure form of carbon. It is obtained by processing coal in the absence of air.

Coal tar is a complex mixture of substances used as a starting material for manufacturing various products, including synthetic dyes, drugs, explosives, perfumes, and plastics.