Correct Answer - Option 2 : Wood
Concept:
Fossil fuel:
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These are the fuel which is formed by natural processes such as decomposition of dead and buried organisms.
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Fossil fuels are made from decomposing plants and animals.
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When fossil fuels are burned carbon and hydrogen react with oxygen in the air to carbon dioxide.
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During this reaction, heat is released which further amplifies the reaction.
- The burning of fossil fuels is the world's largest contributor to air pollution.
- It releases pollutants, including particulate matter, ozone, nitrogen dioxide, sulfur dioxide, mercury, and other hazardous air pollutants.
- Carbon Monoxide (CO) produced from partial fossil fuel combustion.
Calorific value:
- Calorific value is the amount of energy released or produced when 1 kg of fuel burns.
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SI unit is kj/kg.
- A good fuel is considered to have a higher calorific value.
Explanation:
Petrol:
- Petrol (gasoline), is a product of petroleum, produced by distilling and refining petroleum.
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The calorific value of petrol is 45.8 MJ/kg.
Diesel:
- It is a mixture of hydrocarbons obtained by distillation of crude oil.
- Diesel fuel derived from vegetable oils by the process of transesterification.
- The calorific value of diesel fuel is roughly 45.5 MJ/kg.
CNG:
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Compressed Natural Gas (CNG), is natural gas under pressure that remains clear, odourless, and non-corrosive.
- it can be used directly for burning in homes and factories where it can be supplied through pipes.
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The calorific value of compressed natural gas is higher than petrol.
From the above discussion, we can see that, except wood, all others are forms of fossil fuel.
