Page No. 48
The pH value of potable water should be between____________________?
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Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?
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Biological oxidation ponds remove organic matters present in the polluted water by _______________?
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Presence of nitrates in water in excess of 50 ppm causes________________?
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Pick out the wrong statement ?
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Ethanolamine is an absorbent used for the removal of _____________ from air/gas?
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Which of the following industries discharge mercury as a pollutant ?
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