Page No. 51
Which of the following pollutants, if present in atmosphere is detectable by its odour ?
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Pick out the correct statement ?
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When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?
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Iron & manganese present as pollutant in water cannot be removed by__________________?
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Pick out the wrong statement pertaining to ‘green house’ for the plants ?
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Which of the following is the most severe air pollutant ?
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