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This set of MCQs helps students to learn about water softening defined as the process of removing the dissolved calcium and magnesium salts that cause hardness in water.
The total hardness of water is 100ppm as CaCO3 equivalent. What is the type of water?
Which of the following statement is wrong regarding hard water?
Which of the following is not used for removing the permanent hardness?
Which of the following causes the temporary hardness?
The permanent hardness can be removed by adding lime and soda.
Which chemical is used for removing the permanent hardness of Calcium chloride?
Which filter is normally used in the lime soda treatment plant?
What is the pH at which recarbonation should be done?
The permanent hardness is also known as __________.
Pseudo hardness
Non carbonate hardness
Carbonate hardness
Brinell hardness
The Total hardness of soft water as CaCO3 equivalent is __________.
50ppm
100ppm
150ppm
200ppm
The permanent hardness in water is due to the presence of __________.
Sulfates, Chlorides
Sulfates, chlorides, nitrates
Carbonates and bicarbonates
Sulfates and carbonates
The temporary hardness in water is due to the presence of __________.
Sulfates, Chlorides
Sulfates, Chlorides, nitrates
Carbonates and bicarbonates
Sulfates and carbonates
The temporary hardness in water is due to the presence of __________.
Sulfates, Chlorides
Sulfates, Chlorides, nitrates
Carbonates and bicarbonates
Sulfates and carbonates
The minimum reaction time allowed in the recarbonation basin is ____________.
5minutes
10minutes
15minutes
20minutes
The temperature at which the softening of water takes place by lime soda process is ____________.
10o-21oC
20o-30oC
39o-45oC
90oC
The detention period of a lime soda treatment plant is ____________.
1hour
3hours
2-4hours
4-7hours
