Chemistry · General Awareness

Carbon and Fossil Fuels

1,898 Questions

Review fundamental concepts regarding carbon compounds, coal distillation, and fossil fuel formation. This segment covers the chemical properties and industrial applications of natural gas and crude oil. Practicing these questions will strengthen your chemistry foundation for general science sections.

Coal distillationPetroleum formationProperties of crude oilNatural gas applications

Carbon and Fossil Fuels Questions

Multiple choice

Which of the following statements is/are false?

a. Coal is a hard, black combustible mineral that consists mainly of carbon. b. The real source of energy of coal is solar energy. c. The slow process by which the dead plants buried deep under the earth have become coal is called fractional distillation.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false. The slow process by which the dead plants buried deep under the earth have become coal is called carbonisation.

Multiple choice

Match the following:

 
a. Coal gas 1. It is a tough and black solid substance that is obtained by heating coal in the absence of air.
b. Coal tar 2. It is a thick, black liquid having an unpleasant smell that is obtained by heating coal in the absence of air.
c. Coke 3. It is a gaseous fuel that is obtained by the strong heating of coal in the absence of air.

  1. a - 3, b - 2, c - 1

  2. a - 3, b - 1, c - 2

  3. a - 1, b - 3, c - 2

  4. a - 2, b - 3, c - 1

  5. a - 1, b - 2, c - 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Coal gas is a gaseous fuel that is obtained by the strong heating of coal in the absence of air. Coal tar is a thick, black liquid having an unpleasant smell that is obtained by heating coal in the absence of air. Coke is a tough and black solid substance that is obtained by heating coal in the absence of air.

Multiple choice

Which of the following statements is/are false?

a. The chemicals obtained from petroleum and natural gas are called petrochemicals. b. CNG is more polluting than petrol and diesel. c. Natural gas is used as a fuel in thermal power stations for generating electricity.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this statement is false. Petrol and diesel are more polluting than CNG.

Multiple choice

Riya was conducting an experiment and she lit two candles on a table. Then she covered one of the candles with a tall glass. After sometime the candle covered with the glass stopped burning and the other candle continued to burn.

Which of the following reasons will best explain why the covered candle blew out?

  1. Presence of carbon dioxide when the candle is covered.

  2. Presence of nitrogen when the candle is covered.

  3. Absence of carbon dioxide when the candle is covered.

  4. Absence of oxygen when the candle is covered.

  5. Both options 2 and 4.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Correct. Absence of oxygen in the air for the covered candle caused it to blow out. Burning can occur only in thepresence of oxygen and when most of this oxygen is used up by the burning candle, it can no longer burn and blows out.