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NDA 2 2025 GAT, question 100

Topic: Chemistry

Q100

Which one of the following is NOT a chemical change ?

  1. (a) Burning of coal
  2. (b) Rusting of metal
  3. (c) Melting of iceCorrect answer
  4. (d) Reaction of acid with base

Solution.

Answer: (c) Melting of ice

  1. Melting changes water from solid to liquid without changing H₂O into a new substance.
  2. Burning, rusting and acid–base reaction form new substances, so they are chemical changes.