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Thermodynamics question

2025 · 3 Apr · Shift 2 · Q5
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  5. /2025 · 3 Apr · Shift 2 · Q5

Thermodynamics question

2025 · 3 Apr · Shift 2 · Q5

JEE MainChemistryThermodynamicsMCQ+4 / −1
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
    Both Statement I and Statement II are false
  2. B
    Statement I is true but Statement II is false
  3. C
    Both Statement I and Statement II are true
  4. D
    Statement I is false but Statement II is true
View written solutionFree

Correct answer: C

  1. Analyze Statement I

A system containing ice and water in equilibrium is at the melting point.

When heat is supplied to such a system:

  • the heat is used for the phase change of ice to water,
  • this heat is called latent heat of fusion,
  • during phase change, the temperature remains constant until all the ice melts.

So Statement I is true.

  1. Analyze Statement II

At the melting point of ice:

  • the absorbed heat does not increase the average kinetic energy of molecules,
  • therefore, the temperature does not rise,
  • instead, the heat is used to weaken/overcome the intermolecular forces (mainly hydrogen bonding) holding the molecules in the solid structure.

Hence Statement II is also true.

  1. Choose the correct option

Since both Statement I and Statement II are true,

Option C\boxed{\text{Option C}}Option C​

  1. Comparison with stored correct answer

Stored correct answer: C

My derived answer: C

So, the answer agrees with the stored correct answer.

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