Civil Engineering MCQAE Level Civil Engineering
Which of the following about calcium and magnesium salts in water is correct?
Environmental EngineeringHardnessHARD
Choose the correct answer
A
hardness is caused only by sodium chloride
B
hardness causes scale and higher soap consumption
C
hardness is measured as BOD
D
hardness has no operational effect
Correct Answer
B. hardness causes scale and higher soap consumption
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Hardness is commonly expressed as CaCO3 equivalent. Correct option: B.
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