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Q: Which of the following is a chemical change?
  • A. Conversion of milk into curd
  • B. Sublimation of dry ice
  • C. Dissolve sand in water
  • D. Dissolve sugar in water
Correct Answer: Option A - Conversion of milk to curd is a chemical change because new substance lactic acid is formed. No chemical reaction takes place when sand or sugar dissolved in water and in sublimation of dry ice(change of solid CO₂ into gas).Therefore these reactions are physical change.
A. Conversion of milk to curd is a chemical change because new substance lactic acid is formed. No chemical reaction takes place when sand or sugar dissolved in water and in sublimation of dry ice(change of solid CO₂ into gas).Therefore these reactions are physical change.

Explanations:

Conversion of milk to curd is a chemical change because new substance lactic acid is formed. No chemical reaction takes place when sand or sugar dissolved in water and in sublimation of dry ice(change of solid CO₂ into gas).Therefore these reactions are physical change.