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JEE Main 2025 Jan 29 Shift 2, Chemistry Q7: Colligative Properties

JEE Main2025Jan 29, Shift 2Chemistry
Q.

Given below are two statements :

Statement (I) : NaCl is added to the ice at , present in the ice cream box to prevent the melting of ice cream.

Statement (II) : On addition of NaCl to ice at , there is a depression in freezing point.

In the light of the above statements, choose the correct answer from the options given below :

  1. A

    Statement I is false but Statement II is true

  2. B

    Both Statement I and Statement II are true

  3. C

    Both Statement I and Statement II are false

  4. D

    Statement I is true but Statement II is false

Solution

Adding a non-volatile solute like to ice causes depression in freezing point, so the freezing/melting point drops below . The ice then melts at this lower temperature, absorbing latent heat from its surroundings and keeping the ice-cream box colder.

Both statements describe the same correct physical chemistry of cryoscopic mixtures.

Concept behind this question

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