Chemistry · General Awareness

Carbon and Fossil Fuels

1,756 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. A combustible substance cannot catch fire as long as its temperature is higher than its ignition temperature. b. A supporter of combustion is necessary for the combustion to take place. c. The lowest temperature at which a substance catches fire and starts burning is called its ignition temperature.

  1. Only c

  2. Only a and b

  3. Only b

  4. Only b and c

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

It is the correct option. Statement 'a' is false. A combustible substance cannot catch fire as long as its temperature is lower than its ignition temperature.

Multiple choice

Which of the following is an example of explosive combustion?

  1. Burning of LPG in a gas stove.

  2. Burning of white phosphorus.

  3. Burning of wax in a candle.

  4. Burning of coal dust in coal mines.

  5. Burning of firecrackers during festivals.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option. Burning of firecrackers during festivals is an example of explosive combustion.

Multiple choice

Which of the following statements is/are false? a. Dry leaves catch fire easily, but green leaves do not. b. Coal fires cannot be started easily using a matchstick as coal has a high ignition temperature. c. The ignition temperature of wood is lower than that of kerosene.

  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

 It is the correct option. Statement 'c' is a false statement. The ignition temperature of kerosene is lower than that of wood.

Multiple choice

Which of the following statements is/are false? a. Different types of fuels produce different amounts of heat on burning. b. When water is thrown on a burning substance it gets cooled below its ignition temperature and stops burning. c. The amount of heat produced by the burning of one gram of a fuel is called its calorific value.

  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

Statement 'c' is a false statement. The amount of heat produced by the burning of one kilogram of a fuel is called its calorific value.

Multiple choice

Match the following:

a. Rapid combustion 1. It is a very fast combustion reaction in which a large amount of heat, light and sound are produced.
b. Spontaneous combustion 2. It is a combustion reaction which occurs on its own i.e. without the help of any external heat.
c. Explosive combustion 3. It is a combustion reaction in which a large amount of heat and light are produced in a short time.

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

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

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

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

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

This is the correct option. Rapid combustion is a combustion reaction in which a large amount of heat and light are produced in a short time. Spontaneous combustion is a combustion reaction which occurs on its own, i.e., without the help of any external heat. Explosive combustion is a very fast combustion reaction in which a large amount of heat, light and sound are produced.

Multiple choice

Which of the following is not a characteristic of an ideal fuel?

  1. It has a high calorific value.

  2. It burns easily in air at a moderate rate.

  3. It has a very low ignition temperature.

  4. It does not produce any harmful gases or leaves any residue after burning.

  5. It should be cheap, readily available and easy to transport.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option, as this is not a characteristic of an ideal fuel. It should have a proper ignition temperature, neither too low, nor too high.