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 true about fossil fuels?

  1. They are being used at a very slow rate.

  2. They clean the environment.

  3. They take a very long time to form.

  4. They are inexhaustible.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(i)    Fossil fuels are used at a very fast rate. (ii)   Fossil fuels are the remains of plants and animals. They pollute the environment as they are not completely burnt. (iii)  Fossil fuels take a very long time to form as they are the remains of plants and animals which are deeply buried. Option (3) is correct.

Multiple choice

_________ is used as a fuel in automobiles.

  1. Liquefied Natural Gas (LNG)

  2. Compressed Natural Gas (CNG)

  3. Liquefied Petroleum Gas (LPG)

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CNG is used as a fuel in automobiles. CNG is a cleaner fuel. LPG and LNG are also used as a fuel in automobiles, though not as commonly as CNG.

Multiple choice

Which of the following is not true?

  1. The substances which vapourise on burning gives flame.

  2. Camphor on burning gives no flame.

  3. Magnesium ribbon on burning gives a bright white flame.

  4. The luminous zone has unburnt carbon particles.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Camphor on burning produces flame. The color of flame is yellow.

Multiple choice

Why do black shoe polishes have an oily feels?

  1. it is a mixture of oil and powdered graphite

  2. when exposed to air it undergoes a chemical change and produces oily substance

  3. vapour of some amount of oil is left over after its preparation

  4. these are formed by dissolving charcoal in oil
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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Multiple choice

Why is the flame of an LPG stove blue in colour?

  1. It is due to the incomplete combustion of LPG.

  2. It is due to the presence of carbon particles.

  3. It is due to the presence of dust particles.

  4. It is due to the complete combustion of LPG.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The flame of an LPG stove is blue in colour due to the complete combustion of LPG. When the LPG burns completely, the flame turns blue. Blue flame indicates dearest burning rate for a gas.

Multiple choice

Which of the following is/are essential requirement(s) for producing a fire?

  1. Fuel

  2. Air

  3. Heat

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The combustion process requires three basic conditions as given below:

  1. Presence of a combustible substance (it may or may not be categorised as a fuel)
  2. Presence of a supporter of combustion (air)
  3. The temperature of the fuel should be equal to or higher than its ignition temperature (heat is required).
Multiple choice

Which of the following has the characteristics of a good fuel?

  1. Coke

  2. Butane

  3. Coal

  4. Kerosene
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Butane has the characteristics of a good fuel. This is because of the following reasons: 1) It has high calorific value and low ignition temperature. 2) It is easy to store and transport. 3) It causes lesser pollution.