EXAMIANS
Which of the following is the most detrimental for water used in high pressure boiler?
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Presence of iron and manganese in water causes
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Dissolved oxygen content in river water is around __________ ppm.
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The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
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Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
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Maximum permissible residual chlorine in treated water should be __________ mg/litre.
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Higher concentration of nitrogen dioxide in atmospheric air causes
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Presence of __________ hardness is responsible for the temporary hardness in water.
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__________ plant emits large amount of SO₂ as an air pollutant.
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The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
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