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Solution


Q.

Given below are two statements:                                                                      [2025]

Statement I: When a system containing ice in equilibrium with water (liquid) is heated, heat is absorbed by the system and there is no change in the temperature of the system until whole ice gets melted.

Statement II: At melting point of ice, there is absorption of heat in order to overcome intermolecular forces of attraction within the molecules of water in ice and kinetic energy of molecules is not increased at melting point.

In the light of the above statements, choose the correct answer from the options given below:
1 Statement I is true but Statement II is false.  
2 Both Statement I and Statement II are false.  
3 Both Statement I and Statement II are true.  
4 Statement I is false but Statement II is true.  

Ans.

(3)

During melting of a solid, the heat supplied is used to overcome the intermolecular attractive forces of the solid. Kinetic energy of the molecules remains unchanged; hence temperature remain unchanged.