Chemistry-Raoult's Law
NEET Chemistry Raoult's Law Assertion Reason Question
Type: Assertion Reason-assertion-Medium-Class 12
Assertion (A): The lowering of vapour pressure by adding a non-volatile solute to a solvent results in a decrease in the freezing point of the solution. | Reason (R): According to Raoult's Law, the vapour pressure of a solution is directly proportional to the mole fraction of the solvent.
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false.
Correct Answer
Option A
Detailed Explanation
The NCERT context explains that adding a non-volatile solute decreases the vapour pressure of the solution, leading to a lower freezing point. Raoult's Law explains this by stating the vapour pressure of the solution depends on the mole fraction of the solvent.
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