Question

In cold countries, water does not freeze all at once in ponds and lakes. This happens due to what?

• A. High specific latent heat of fusion of ice
• B. High specific latent heat of fusion of water
• C. High specific latent heat of vaporisation of ice
• D. None

Answer 1

The correct option is A High specific latent heat of fusion of ice

In cold countries, water does not freeze all at once in ponds and lakes. This is due to the fact that specific latent heat of fusion of ice is $336J{g}^{-1}$, so as to freeze water, a large quantity of heat has to be withdrawn, hence it freezes slowly.