Statement I Petroleum is a mixture of many different hydrocarbons of different densities. Statement II The grade of petroleum, depends mainly on the relative proportion of the different hydrocarbons. A. Both the statements are individually true and statement II is the correct explanation of statement I B. Both the statements are individually true but statement II is not the correct explanation of statement I C. Statement I is true but statement II is false D. Statement I is false but statement II is true

The correct answer is: Both the statements are individually true and statement II is the correct explanation of statement I.

Petroleum is a naturally occurring liquid found in geological formations beneath the Earth’s surface. It is a mixture of hydrocarbons, which are compounds made up of hydrogen and carbon atoms. The hydrocarbons in petroleum can be of different lengths, and this determines the density of the petroleum. The grade of petroleum depends on the relative proportions of the different hydrocarbons present. For example, crude oil with a high proportion of light hydrocarbons, such as gasoline and kerosene, is considered to be a high-grade petroleum. Crude oil with a high proportion of heavy hydrocarbons, such as asphalt and tar, is considered to be a low-grade petroleum.

Statement I is true because petroleum is a mixture of many different hydrocarbons of different densities. Statement II is true because the grade of petroleum depends mainly on the relative proportion of the different hydrocarbons. Statement II is the correct explanation of statement I because it explains why petroleum has different grades.