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Question
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.
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.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In benzene acetic acid dime rises but in water, it does not.
This is because benzene is non-polar whereas water is polar. Hence, the number
of particles becomes 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 i.e. they have different depression in
freezing point.
In benzene acetic acid dime rises but in water, it does not. This is because benzene is non-polar whereas water is polar. Hence, the number of particles becomes 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 i.e. they have different depression in
freezing point.
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