Among the following activities, which one is not a chemical reaction?

Options :
  1. Burning of paper
  2. Digestion of food
  3. Conversion of water into steam
  4. Burning of coal

Answer and Explanation :-

Answer: Option 3


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Whoso beset him roundWith dismal storiesDo but themselves confound His strength the more is.
-John Bunyan The Pilgrim's Progress