Q. Half of the mass of atmosphere is present in lower part of it in

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Q. Water is made disinfectant during purification of water in the step

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Q. The waste products are given out from chimneys, automobiles produce pollution

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Q. The elevated concentration of metals causes clogs of gills in fish

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Q. Reducing smog contains

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Q. The residence time of NO and NO₂ in atmosphere are respectively in days

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Q. Acidification of soil can leach metals

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Q. Paddy fields produce significant amount of gas

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Q. Mean residence time of methane in atmosphere in years is

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Q. 1-9 % of sulphur is present in

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Q. Eample of more toxic element is

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Q. PAN, Ozone, sulphuric acid, peroxybenzol, aldehydes and ketones are called

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Q. Poisoning of CO can be reversed by giving oxygen at pressure

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Q. In water, most oxidizing agent is dissolved O₂ in the concentration ranges from

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Q. The gas essential for life is

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Q. SO₂ in atmosphere is converted into

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Q. Underground or surface water is treated because it is

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Q. A hole used to dump the municipal wastes is called

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Q. Components of environment necessary for sustaining life are

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Q. The drops of rain fall down due to density than air

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