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

Choose thew option in which the word BURN is used incorrectly or inappropriately.

(1) The incident of a steep fall from the terrace in childhood was burned in her memory. (2) The sky and the bottom of the picture needed substantial burning in. (3) Natural gas produces the cleanest burn of other fuels. (4) In the olden days, before the cure for rabies was discovered, the doctor would burn the wound to ward off infection. (5) In a typical Western diet, all the energy in protein is burned up daily.

  1. 4

  2. 2

  3. 5

  4. 1

  5. 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct; the usage of the word is inappropriate. The sent. needs the word 'cauterize'  which means ' to burn for healing purpose'.

Multiple choice

The electrical fires or fires caused due to burning of oil or petrol are extinguished by using _________ fire extinguisher.

  1. water

  2. dry powder

  3. carbon dioxide gas

  4. wet chemical

  5. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option. The electrical fires or fires caused due to burning of oil or petrol are extinguished by using carbon dioxide gas fire extinguisher. Carbon dioxide covers the fire and cuts off the oxygen supply, which in turn, extinguishes the fire.

Multiple choice

Match the following ||| |---|---| |a. When a combustible material burns at a slow or moderate rate, it is called|1. spontaneous combustion| |b. When a combustible material burns quickly to produce heat and light, it is called|2. slow combustion| |c. When a combustible material suddenly bursts into flames, without the application of apparent cause, it is called|3. rapid combustion|

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

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

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

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

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

This is the correct option. When a combustible material burns at a slow or moderate rate, it is called slow combustion. When a combustible material burns quickly to produce heat and light, it is called rapid combustion. When a combustible material suddenly bursts into flames, without the application of apparent cause, it is called spontaneous combustion.

Multiple choice

Which of the following is an example of spontaneous combustion?

  1. The burning of wax in a candle

  2. The burning of coal dust in coal mines

  3. The burning of cooking gas in a gas stove

  4. The exploding of crackers during festivals

  5. The burning of kerosene oil in a kerosene stove
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option as the burning of coal dust in coal mines is an example of spontaneous combustion. Coal dust burns at room temperature inside the cold mines, spontaneously.

Multiple choice

Which of the following statements is/are false?

a. The materials that produce light energy on burning in air are called fuels. b. When magnesium is heated in air, it catches fire and burns with a dazzling white flame. c. On heating, charcoal burns to produce a large amount of heat and a dull red light.

  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
A Correct answer
Explanation

This is the correct option as this statement is false. The materials that produce heat energy on burning in air are called fuels.

Multiple choice

Which of the following methods cannot be used to extinguish fire?

a. By removing the combustibe substances b. By removing the heat c. By increasing the supply of air to the burning substances

  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 fire cannot be extinguished by increasing the supply of air to the burning substances. It can be extinguished by cutting off the supply of air to the burning substances.

Multiple choice

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

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

  2. It has a low calorific value.

  3. It has a proper ignition temperature.

  4. It neither produces any harmful gases nor leaves any residue after burning.

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

This is the correct option as this is not a characteristic of an ideal fuel. An ideal fuel should have high calorific value so that it can produce a large amount of heat.

Multiple choice

If the oxygen supply is sufficient, then the fuel burns completely, producing mainly a blue flame. In which of the following cases is a blue flame produced?

a. The burning of LPG in a kitchen gas stove b. The burning of kerosene in a lamp c. The burning of a wax candle

  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
A Correct answer
Explanation

This is the correct option as in the burning of LPG in a kitchen gas stove, a blue flame is produced. The blue flame is produced when there is a complete combustion of LPG.