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JEE Main 2025 Apr 3 Shift 2, Chemistry Q16: Liquid And Solid State

JEE Main2025Apr 3, Shift 2Chemistry
Q.

Given below are two statements :

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. A

    Statement I is true but Statement II is false

  2. B

    Both Statement I and Statement II are false

  3. C

    Both Statement I and Statement II are true

  4. D

    Statement I is false but Statement II is true

Solution

During the ice water phase change at 0 C, the heat supplied is used entirely as latent heat of fusion to break the hydrogen-bonded lattice of ice. Temperature remains constant until the last bit of ice has melted, so Statement I is correct.

Since temperature is unchanged at the melting point, the average kinetic energy of the molecules does not increase; the added energy goes into the potential-energy component associated with overcoming intermolecular attractions. Statement II is also correct and correctly explains Statement I.

Both statements are true.

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