Question

Why does ice at 0⁰C have a better cooling effect than water at 0⁰C?

• A. As ice has a greater SHC as compared to water
• B. As ice absorbs extra amount of heat equivalent to latent heat of fusion which water already possesses
• C. As water absorbs extra amount of heat equivalent to latent heat of fusion which ice already possesses
• D. As ice has a larger volume than water of the same mass
• E. As ice absorbs heat on cooling but water liberates heat on cooling due to anomalous behaviour of water

Answer 1

The correct option is B

As ice absorbs extra amount of heat equivalent to latent heat of fusion which water already possesses

Water at 0^oC possesses latent heat which Ice at 0^oC does not. Ice on melting absorbs Latent heat which water at 0^oC does not. Ice has a large value of latent heat [SLHF = 336Jg^-1] Thus ice absorbs a large amount of heat on melting from the surroundings & hence is a better cooling agent.