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

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

Which is not correct for CO₂?

  1. it is used for hardening of mortars

  2. it is used as carbogen to stimulate respiratory system

  3. it is used as refrigerant

  4. All
Reveal answer Fill a bubble to check yourself
D 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.  

Multiple choice

The hottest part of the gas flame is known as

  1. luminous zone

  2. dark zone

  3. blue zone

  4. non-luminous zone
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Non-luminous zone is the hottest part of the gas flame. It forms the outermost region of the flame and complete combustion takes place here.