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NDA 2 2025 GAT, question 105

Topic: Chemistry

Q105

Which one of the following is considered to be the purest source of water ?

  1. (a) River water
  2. (b) Sea water
  3. (c) Well water
  4. (d) Rain waterCorrect answer

Solution.

Answer: (d) Rain water

  1. Rainwater is the conventional answer among natural sources because evaporation leaves most dissolved salts behind before condensation.
  2. This does not mean collected rainwater is chemically pure or safe to drink: it can absorb gases and pick up pollutants.