Question

Which of the following is not a constituent of petroleum?
(a) paraffin wax (c) petrol
(b) lubricating oil (d) coke
NCERT Class VIII
Science - Exemplar Problems
Chapter 5. Coal and Petroleum

Answer 1

Answer:

d . coke . is the purest form of carbon .

Answer 2

Option D. Coke is not a constituent of petroleum.

• When petroleum is extracted from the ocean floor, it undergoes fractional distillation.
• In this process, we obtain different petroleum products at varying temperatures and pressure. Some of the products obtained are paraffin wax, lubricating oil, and petrol.
• However, coke is obtained from coal. It is also a by-product of the destructive distillation of coal.
• Coke is one of the purest forms of carbon because it contains about 85% of carbon.
• It is used in iron furnaces and by blacksmiths who require high-temperature conditions.
• It is also used in the steel manufacturing industry.