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Assertion: the fusion curve of water slopes backwards. Reason: ice is less dense than liquid water.

  • A.the assertion is true but the reason given for it is false
  • B.the assertion is false although the reason offered is a true statement in itself
  • C.both the assertion and the reason are true and the reason explains the assertion
  • D.both the assertion and the reason are true but the reason does not explain the assertion

Answer: C

Melting reduces the volume, so by Le Chatelier's principle pressure favours the liquid and the melting point falls. The negative volume change is exactly the term that sets the sign of the slope in the Clausius-Clapeyron relation.

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