JEE Main · 2025 · Shift-IIeasySOL-143

Given below are two statements: Statement (I): NaCl is added to the ice at 0°C, present in the ice cream box to prevent…

Solutions · Class 12 · JEE Main Previous Year Question

Question

Given below are two statements:

Statement (I): NaCl is added to the ice at 0°C, present in the ice cream box to prevent the melting of ice cream. Statement (II): On addition of NaCl to ice at 0°C, there is a depression in freezing point.

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

Options
  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

Correct Answera

Statement I is false but Statement II is true

Detailed Solution

Strategy:\n> Analyze the physics of freezing mixtures and colligative properties.\n\nStatement I: "\ceNaCl\ce{NaCl} is added... to prevent the melting of ice cream."\n- This is False. \ceNaCl\ce{NaCl} is added to ice to create a freezing mixture with a temperature significantly below 0°C (up to −21°C). This allows the ice cream to freeze or stay frozen. The mixture itself actually melts faster because it is a solution, but it absorbs heat from the ice cream to do so.\n\nStatement II: "On addition of \ceNaCl\ce{NaCl} to ice... there is a depression in freezing point."\n- This is True. Adding a non-volatile solute like \ceNaCl\ce{NaCl} to water lowers its freezing point (Raoult's Law).\n\ntextAnswer:(1)\boxed{\\text{Answer: (1)}}

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