Assertion: A $1 m N a C l (a q)$ solution will freeze at a temperature below $273 K$ .
Reason: As a solute is added to a solvent, the boiling point increases while the freezing point decreases.

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

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Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

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Assertion is true but Reason is false.

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Assertion is false but Reason is true.

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Both Asssertion and Reason are false

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Statement I: A 1m NaCl (aq)
solution will freeze at a temperature below 273 K
Because
Statement II: As a solute is added to a solvent, the boiling point increases while the freezing point decreases. The freezing point of pure water is 273 K. The freezing point of 1 m aq NaCl solution will be lower than that.
Hence, both statements are true and second statement is correct explanation for the first statement.

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Assertion: A 1m NaCl(aq) solution will freeze at a temperature below 273 K.Reason: As a solute is added to a solvent, the boiling point increases while the freezing point decreases.

Assertion: A $1 m N a C l (a q)$ solution will freeze at a temperature below $273 K$ .
Reason: As a solute is added to a solvent, the boiling point increases while the freezing point decreases.