Question

Temperature of ice at 0⁰C does not change inspite of heating it, till it melts completely. Why?

• A. The heat is utilised to create weak forces between the water molecules
• B. The heat is utilised to break the bonds between hydrogen and oxygen atoms of the water molecules
• C. The heat is utilised to overcome the interatomic distances of water molecules and separate them
• D. The heat is utilised to overcome the inter-molecular distances between the water molecules and separate them
• E. The heat is utilised to increase the Kinetic Energy of the water molecules

Answer 1

The correct option is D

The heat is utilised to overcome the inter-molecular distances between the water molecules and separate them

Temperature does not change as all the heat (called Latent Heat) is used up in changing the state by separating the molecules & increasing the intermolecular distances (i.e. Heat is used in increasing the PE of the molecules).