

MCQOPTIONS
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1. |
Detergents Produce lather with hard water because? |
A. | they are soluble in hard water |
B. | they are colorless substances |
C. | the calcium and magnesium salts of sulphonic acids are soluble in water |
D. | they form sodium carbonate with hard water |
Answer» D. they form sodium carbonate with hard water | |