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Q: Which of the following substance is insoluble in water?
  • A. Milk
  • B. Sugar
  • C. Salt
  • D. Chalk Powder
Correct Answer: Option D - Chalk powder is insoluble in water while other substance bike milk, salt and sugar are soluble ins water. The chemical composition of chalk powder is CaCO₃. A trace amount of CaCO₃ is desidned into water which major component remains insoluble.
D. Chalk powder is insoluble in water while other substance bike milk, salt and sugar are soluble ins water. The chemical composition of chalk powder is CaCO₃. A trace amount of CaCO₃ is desidned into water which major component remains insoluble.

Explanations:

Chalk powder is insoluble in water while other substance bike milk, salt and sugar are soluble ins water. The chemical composition of chalk powder is CaCO₃. A trace amount of CaCO₃ is desidned into water which major component remains insoluble.