Single Answer MCQ
Q-00019152
Detergents are used instead of soap in hard water because they do not form what?
1
Foam
2
Scum
3
Emulsions
4
Bubbles
Answer and Solution
Answer
B. Scum
Solution:
Detergents do not form scum with hard water because they are generally made from synthetic surfactants that remain effective in the presence of calcium and magnesium ions, unlike soap which precipitates as scum.
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