WorksheetsWater and its Treatment
Total questions: 15
Worksheet time: 9mins
The molecular weightof H2O is
18
16
2
17
Both temporary and permanent hardness of water can be removed by
boiling
distillation
filtration
decantation
When temporary hard water is boiled, one of the substances formed is
calcium bicarbonate
calcium sulfate
hydrogen chloride
carbon dioxide
The purest form of naturally occurring water is
rain water
river water
pond water
well water
Calgon is used for removal of
sodium carbonate
permanent hardness of water
potassium carbonate
none of these
Sedimentation is a physical process used in wastewater treatment to
remove particles that are less dense than water
remove particles that are more dense than water
remove the pertinacious material from the water
none of the above
Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
Chlorination
Treating with potassium permagnate
UV radiation
Treating with bleaching powder
Permanent hardness of water is caused by the presence of
bicarbonates of calcium and magnesium
carbonates of sodium and potassium
chlorides and sulfates of calcium and magnesium
phosphates of sodium and potassium
The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is
600 ppm
300 ppm
500 ppm
1000 ppm
Buffer solution used in Determinaton of total hardness of water by complexometric metod
Acidic buffer (CH3COOH+CH3COONa)
Ammonium buffer (NH4Cl+NH4OH)
alkaline (bufferNaCl+NaOH)
Basic buffer(BaCl2+Ba(OH)2
Temporary hardness of water is caused by the presence of
chlorides of calcium and magnesium
sulfates of calcium and magnesium
bicarbonates of calcium and magnesium
carbonates of sodium and potassium
Alum is a
Alum is a
Coagulant
Flocculent
Catalyst
Disinfectant
Which of the following physical method is used in sterilization of water
Boiling
UV treatment
Chlorination
both a&b
Calgon is used for removal of
sodium carbonate
permanent hardness of water
potassium carbonate
none of these
Calgon chemical formula
Na2[Na2(Po3)6]
Na4[Na4(Po3)6]
Na2[Na4(Po3)6]
Na2[Na4(PH3)6]
