Q.

Assertion(A) : Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components (or) less than both the components.

Reason(R): The composition of vapour phase is same as that of the liquid phase of an azeotropic mixture.

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a

Both (A) and (R) are true and (R) is the correct explanation of (A)

b

Both (A) and (R) are true and (R) is not the correct explanation of (A) 

c

(A) is true but (R) is false

d

Both (A) and (R ) are false

answer is B.

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Detailed Solution

A mixture which distill without change in composition is called an azeotropic mixture. A mixture showing positive deviation shows minimum boiling azeotrope whereas the mixture showing negative deviation shows maximum boiling azeotrope at a particular composition.

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Assertion(A) : Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components (or) less than both the components.Reason(R): The composition of vapour phase is same as that of the liquid phase of an azeotropic mixture.