A) They are soluble in hard water
B) They are colourless substance
C) The calcium and magnesium salt of sulphonic acid are soluble in water
D) They form sodium carbonate with hard water
Correct Answer: C
Solution :
[c] Soap is less effective in hard water since it reacts to form a calcium or magnesium salt of the organic acid in the soap and forms a grayish soap scum with no lather. Detergents, on the other hand, lather in both hard and soft water.
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