Question 1 : What is the pH at which recarbonation should be done?
1. 7
2. 4.5
3. 8.2
4. 9.5
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Question 2 : The Total hardness of soft water as CaCO₃ equivalent is
1. 50ppm
2. 100ppm
3. 150ppm
4. 200ppm
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Question 3 : Which of the following causes the temporary hardness?
1. CaSO₄
2. MgSO₄
3. MgCl₂
4. Ca (HCO₃) ₂
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Question 4 : The time required for the mixing of lime and soda in lime soda process is
1. 10min
2. 20min
3. 40min
4. 80 min
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Question 5 : Permutit has an exchange value of ________ grams of hardness per m3 of zeolite.
1. 10,000
2. 20,000-30,000
3. 35,000-40,000
4. 40,000-50,000
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Question 6 : The permanent hardness in water is due to the presence of
1. Sulfates, Chlorides
2. Sulfates, chlorides, nitrates
3. Carbonates and bicarbonates
4. Sulfates and carbonates
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Question 7 : The temperature at which the softening of water takes place by lime soda process is
1. 10^o-21^oC
2. 20^o-30^oC
3. 39^o-45^oC
4. 90^oC
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Question 8 : The color of the natural zeolite is
1. Green
2. Grey
3. Black
4. Blue
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Question 9 : State whether the following statement is true or false
The zeolite process is unsuitable for water containing iron and manganese.
1. True
2. False
3.
4.
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Question 10 : Which chemical is used for the removing the permanent hardness of Calcium chloride?
1. Lime
2. Chlorine
3. Soda
4. Both lime and soda
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