Page No. 72
Which of the following is an example of liquid in gas solution?
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Which of the following solutions of H2SO4 is more concentrated ?
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Ozone hole is substantial depletion of ozone in every year during__________________?
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Chlorination of water may be harmful if the water contains_________________?
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A single chlorine free radical can destroy how many ozone molecules ?
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Which of the following factors help to measure quallity of water ?
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Which of the following gases is the main cause of acid rain ?
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Which of the following is not primary pollutant__________________?
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The yellow colour in photochemical smog is due to presence of__________________?
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