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Numerical on Calculation of Hardness by CaCO3 method
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1. 1mg/lit=
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1 point
0.07 0Clark
0.01 0Clark
0.1 0Clark
0.7 0Clark
2. Which of the following equation is correct?
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1 point
1ppm = 0.1mg/L = 0.1 degree F = 0.07 degree Clark
1ppm = 1mg/L = 0.1 deree F = 0.07 degree Clark
1ppm = 1mg/L = 0.1 degree F = 0.7 degree Clark
1ppm = 1mg/L = 1 degree F = 0.07 degree Clark
3. Temporary hardness is also called as ___
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1 point
non carbonate hardness
bicarbonate hardness
non- bicarbonate hardness
carbonate hardness
4. Permanent hardness is also called as ___
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1 point
non carbonate hardness
bicarbonate hardness
non- bicarbonate hardness
carbonate hardness
5. CaCO3 is used in the calculation of hardness because___
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1 point
it is most soluble salt that can be precipitated in water treatment
it contains all required molecules
its molecular wt. is 50
it is easily available
6. What is conversion factor for equivalence of CaCO3 for CaCl2?
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1 point
100/100
100/111
100/136
100/95
7. What is the hardness of the water sample having the amount of Mg(HCO3)2 = 146 ppm?
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1 point
100
146
95
111
8. Which of the following is/ are the temporary hardness causing substance/s
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1 point
Ca(HCO3)2
MgCl2
CaCl2
CO2
9. Which of the following salt is not responsible for hardness in water?
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1 point
Ca(HCO3)2
MgCl2
CaCl2
NaCl
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