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प्र: which of the following are chemical changes?

  • 1
    Cooking of Food
  • 2
    Digestion of Food
  • 3
    Freezing of water
  • 4
    Water is heated up
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उत्तर : 1. "Cooking of Food"
व्याख्या :

Answer: A) A & B Explanation: A) Cooking of Food  ------ Chemical Change B) Digestion of Food ----- Chemical Change C) Freezing of water ----- Physical Change D) Water is heated up ---- Physical Change because here the chemical composition of the substance changes in A & B only.   Since we know that, If the chemical composition is changing then it is a chemical change and if the chemical composition is remaining the same, then it is a physical change.

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