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Assertion (A): Hoar frost is not simply frozen dew.
Reason (R): It forms by direct deposition of vapour as ice without passing through the liquid phase.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both are true and the reason gives the distinction, and the feathery crystal shapes reflect that growth. Frozen dew produces rounded beads of ice with quite a different appearance. The crystal habit reveals which process was at work.

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