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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 (c) oxygen (d) water vapour |
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Answer» 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 (c) oxygen (d) water vapour |
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