AIIMS 2018 Chemistry Colligative Properties Assertion Reason Question
Assertion :A non volatile solute added in solvent liquid then freezing point of mixture decreases.
Reason :Vapour pressure decrease by addition of non volatile solute, so equilibrium point where Vp of solid and VP of liquid are equal can reach at lower temp.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is correct because at the freezing point, the vapor pressure of a solid and its corresponding liquid phase (e.g., H₂O) are equal, allowing for phase equilibrium. The reason is also correct, as adding a solute (e.g., NaCl) to a solvent (e.g., H₂O) lowers the vapor pressure due to the colligative properties, which occur because solute particles disrupt the solvent's ability to escape into the vapor phase. Other options are not relevant as they do not provide alternative assertions or reasons related to the question's context. Understanding these concepts is crucial for grasping the principles of phase changes and colligative properties in solutions.
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