What is the main constituent of coal?

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Hydrogen

Oxygen

Carbon

Nitrogen

answer is C.

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Detailed Solution

Concept- Coal is a brown-black combustible material that is mainly used as fuel. When burned (reaction with oxygen), coal gives carbon dioxide or carbon monoxide as the main products.
Now, coal is formed by the decomposition of dead plant matter, which takes approximately millions of years. This transformation is believed to be the result of heat and pressure.
Coal can be characterised into many types depending on the carbon composition. Different types of coal include anthracite, peat, lignite, and bitumen.
There are many elements in coal. The element with the highest % is carbon, which makes up to 85% of the composition of black coal. However, the percentage of carbon can vary depending on the type of coal, but carbon still remains the most common element in its composition.
-Hydrogen, nitrogen, oxygen and sulphur are also present in coal, but their amounts are very low.
Hence, the correct option is (3).

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