Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different. Reason: Water is polar and benzene is non-polar,A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: A
Solution :
In benzene acetic acid dime rises but in water it does not. This is because benzene is non-polar whereas water is polar. \[\therefore \]The number of particles become different in both the solvents. Depression in freezing point is a colligative property i.e.} it depends upon the number of particles in solution. Hence, molecular mass determined by depression in freezing point method comes out to be different (They have different depression in freezing point.
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