Which of the following are undesirable constituents of coal?

Carbon

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Oxygen

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Sulfur

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None of these

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Solution

The correct option is C Sulfur
Coal is a rock which is formed from the burries of dead plants and animals for millions of years. Due to heat and pressure, physical and chemical changes takes places which results in the formation of coal. Coal is majorly made up of carbon and other constituents includes oxygen, sulphur, nitrogen, ash etc.

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