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NDA 2024 · PYQ · Properties of Water · medium

Which one among the following statements with reference to the properties of water is not correct?

  1. A.The specific heat of water is abnormally high.
  2. B.Latent heat of fusion of water is very low.✓ Correct
  3. C.Density of water is higher than ice.
  4. D.Pure water is a non-conductor of electricity.

Explanation

The latent heat of fusion of water is actually very high (about 334 J/g or 80 cal/g), not low. This high value is due to strong hydrogen bonding in ice that requires significant energy to break. The other statements are correct: water has an abnormally high specific heat capacity (4.18 J/g·°C) due to hydrogen bonding; the density of liquid water (1 g/cm³ at 4°C) is higher than that of ice (0.92 g/cm³), which is why ice floats; and pure water is a poor conductor of electricity because it has very few free ions.
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