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Soap used in hard water leaves an insoluble substance behind, called:
AFoam
BGel
CAsh
DScum
Answer & Solution
Correct answer: D. Scum
1. Hard water stops soap lathering easily.
2. A solid residue is left on the cloth.
3. That residue is scum.
_Source: syllabus Science Class X, Chapter 4, Carbon and its Compounds._
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