Presence of iron and manganese in water causes___________________?

Byadmin March 11, 2019August 29, 2021

Presence of iron and manganese in water causes___________________?

A. Reduction in its dissolved oxygen content
B. Discoloration of bathroom fixtures
C. Temporary hardness
D. None of these

Chemical Environmental Engineering

The most commonly used chemical coagulant in water treatment is________________?

The most commonly used chemical coagulant in water treatment is________________?

A. Ferrous sulphate
B. Alum
C. Lime
D. Hydrazine

Read More The most commonly used chemical coagulant in water treatment is________________?
Chemical Environmental Engineering

Presence of _____________ hardness is responsible for the temporary hardness in water?

Presence of _____________ hardness is responsible for the temporary hardness in water?

A. Carbonate
B. Calcium
C. Chloride
D. Sulphate

Read More Presence of _____________ hardness is responsible for the temporary hardness in water?
Chemical Environmental Engineering

Which of the following is a manmade source of air pollution ?

Which of the following is a manmade source of air pollution ?

A. Automobile exhaust
B. Forest fire
C. Bacterial action in soil and swamp areas
D. All A., B. and C.

Read More Which of the following is a manmade source of air pollution ?
Chemical Environmental Engineering

Which of the following air pollutants is not toxic to vegetation i.e., doesn’t cause vegetation damage ?

Which of the following air pollutants is not toxic to vegetation i.e., doesn’t cause vegetation damage ?

A. Smog & ozone
B. Hydrogen fluoride & nitrogen oxides
C. Sulphur dioxide & spray of weed killers
D. Carbon monoxide

Read More Which of the following air pollutants is not toxic to vegetation i.e., doesn’t cause vegetation damage ?
Chemical Environmental Engineering

Iron & manganese present in the polluted water is removed by __________________?

Iron & manganese present in the polluted water is removed by __________________?

A. Simple filtration
B. Oxidation followed by settling & filtration
C. Chemical coagulation
D. Chlorination only

Read More Iron & manganese present in the polluted water is removed by __________________?
Chemical Environmental Engineering

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_________________?

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_________________?

A. Poor visibility due to sky darkening
B. Irritation in eyes
C. Respiratory trouble
D. All A., B. and C.

Read More 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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