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    What is the role of ultraviolet (UV) radiation in the water purification systems?
    • 1. It inactivates/kills the harmful microorganism in water.
    • 2. It removes all the undesirable odours from the water.
    • 3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
    Which of the statements given above is/are correct?

  • 1 only
  • 2 and 3 only
  • 1 and 3 only
  • 1, 2 and 3

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