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 chemistry combustion extinguishing fire ways to control fire combustion, fuels and flame

Fire can be extinguished by spraying: 

  1. carbon dioxide

  2. carbon tetrachloride

  3. water

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

Fire can be extinguished by spraying, carbon dioxide, carbon tetrachloride or water.
Note:
Fire is extinguished by
(A) removing all combustible substance. Fuel is one of the requirements for producing fire. In the absence of fuel, combustion will not occur.
(B) cutting off the supply of air. Air (oxygen) is essential for combustion. In the absence of air, combustion will not occur.
(C) cooling the burning substance. This reduces the temperature below its ignition temperature. The fire will not spread.

Multiple choice chemistry combustion extinguishing fire ways to control fire combustion, fuels and flame

______ is the extinguisher used for inflammable material like petrol.

  1. Water
  2. $CO _2$

  3. Oil

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

Some Class-B fires (hydrocarbons, petroleums, and fuels on fire) cannot be efficiently controlled with water. $CO _2$ being heavier than oxygen covers the fire like a blanket. Hence, one of the important factor for fire is cut off and the fire is controlled.

Multiple choice chemistry combustion extinguishing fire ways to control fire combustion, fuels and flame

The lowest temperature at which a substance catches fire?

  1. Flammable temperature

  2. Ignition temperature

  3. inflammable temperature

  4. None of above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ignition temperature is the lowest temperature at which a combustible substance when heated (as in a bath of molten metal) takes fire in air and continues to burn. It is also called also autogenous ignition temperature.

Multiple choice chemistry combustion extinguishing fire ways to control fire combustion, fuels and flame

Inflammable substances have?

  1. Low ignition temperature

  2. Highest ignition temperature

  3. Moderate ignition temperature

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The substances which has a very low ignition temperature and can catch fire easily with a flame are called as inflammable substances. It is the ability of a substance to burn or ignite, causing fire or combustion. For eg; LPG, petrol etc. 

Multiple choice chemistry combustion extinguishing fire ways to control fire combustion, fuels and flame

Fire can be controlled by removing which of the following factor?

  1. Fuel

  2. Air

  3. Heat

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

The three essential things required to control fire are fuel, heat and air. 

The air supplies oxygen and heat raises the temperature of the fuel beyond the ignition temperature. 
Fire can be controlled by removing any one of these factors. 


Hence, the correct option is $D$.


Multiple choice chemistry combustion extinguishing fire ways to control fire combustion, fuels and flame

Which of the following is the most common fire extinguisher?

  1. Foam
  2. $CO _2$

  3. Water

  4. Dry powder
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cheapest and most widely used fire extinguisher is water because it is easily available. But it is preferably used for class A fires. like fire in solids, wood, paper etc. Not suitable for Class B (Liquid) fires, or where electricity is involved. 


Hence, the correct answer is option $C$.

Multiple choice commercial applications sources of water conservation of natural and energy resources energy conservation and sources importance of the conservation of natural resources reduce, recycle, reuse

Energy source which do not evolve CO$ _2$ is

  1. Oil

  2. Coke

  3. Nuclear energy

  4. Other organic substances
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oil is a mixture of molecules that mainly contain carbon and hydrogen. When it burns it also produces CO$ _2$, but 25% less than coal for the same amount of energy (because the combustion of hydrogen gives energy but generates only water). 

Coke and other organic substances when used as source of energy, CO$ _2$ can be released. 
Nuclear energy can not evolve CO$ _2$. Thus, the correct answer is option C.

Multiple choice geography hazards major hazards in india and prevention tsunami and floods pollution and environment study of water pollution threats to water resource

Which fuel should be used to control Pollution ?

  1. Natural gas

  2. Petrol

  3. Diesel

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

Natural gas is a versatile, clean-burning, and efficient fuel that is used in a wide variety of applications. It can be used in the form of compressed natural gas (CNG) or liquefied natural gas (LNG) to fuel cars and trucks.  Natural gas as a vehicle fuel is much cheaper and environmentally cleaner than petroleum products.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Carbon tetrachloride is inflammable. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon tetrachloride (CCl4) is non-flammable and has historically been used as a fire extinguishing agent. Therefore, the statement that it is inflammable is false.

Multiple choice chemistry manmade materials synthetic rubber rubber polymer

In the process of vulcanization:

  1. natural rubber is heated with sulphur

  2. natural rubber is heated with carbon

  3. natural rubber is heated with phosphorous

  4. natural rubber is heated with sodium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vulcanization is a chemical process by which the physical properties of natural or synthetic rubber are improved. In its simplest form, vulcanization is brought about by heating rubber with sulfur.

Multiple choice physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

The substance that helps to ______ friction are called lubricants.

  1. increase

  2. decrease

  3. create

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

Oils, grease, graphite, etc., are examples of lubricants. These form a thin layer between the two surfaces in contact thus avoiding them from scrubbing directly against each other. This makes the movement smooth and reduces friction.

Multiple choice chemistry chemical thermodynamics calorific value occurrence of carbon compounds in nature study of enthalpy

Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.

  1. sulphur

  2. oxygen

  3. hydrogen

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

The energy contained in a fuel or food, determined by measuring the heat produced by the complete combustion of a specified quantity of it. This is now usually expressed in joules per kilogram. Oxygen present in dry gaseous fuel does not contribute to its calorific value.