Fly ash is produced by __________.

petroleum

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natural gas

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coal

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all of the above

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Solution

The correct option is C coal
When coal is burnt in sufficient quantity in big factories, it leaves 10% to 20% of ash. This ash is carried upward due to air and causes pollution problems.

Hence, the correct option is $C$

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Similar questions

Which of the following is usually not a water pollutant?

(a) sewage

(b) fertiliser

(d) pesticide

Which of the following will be reduced in air in a city forest when a lot of dust and fly ash is emitted by a coal-based factory in the vicinity?

(a) nitrogen

(b) carbon dioxide

(d) water vapour

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