Question

Assertion. A mixture of acetone and methanol can be separated by fractional distillation.
Reason. The difference between their boiling points is very less
(a)both assertion and reason are true,and reason is the correct explanation of assertion.
(b)but assertion and reason are true but reason is not the correct explanation of assertion.
(c)both assertion and reason are false.
(d)assertion is false but reason is true.

Answer 1

Answer:

(d) assertion wrong, reason correct

Explanation:

Their mixture is maximum boiling azeotrop so they have same vapour pressure at certain concentration and can't be seperated

Their same vapour pressure is due to inter-mol. forces, not because they have same boiling pt.(it is different)

Answer 2

Answer:

Assertion is wrong and reason is correct

Explanation:

Methanol and acetone form a minimum boiling azeotrope as both these solvents are polar solvents and difference in their boiling points is very less (Acetone B.P. 56.2 °C and Methanol B. P. 64.5 °C).  Hence they can not be separated by conventional fractional distillation. The azeotropic composition is 78.8% acetone and 21.2% methanol.

For separation extractive, salt effect or pressure swing distillation will be required.