AP EAMCET · Chemistry · Solutions

If two liquids A and B form a minimum boiling azeotrope at some specific composition, then which statement among the following is correct?

A A-B molecular interactions are stronger than A-A and B-B interactions.
B The total vapour pressure of the mixture is greater than that corresponding to an ideal solution.
C There is a slight decrease in volume when the two components are mixed.
D ${ΔH}_{mix}$ will have a negative value.

Verified Solution

Answer & Solution

Correct Answer

(B) The total vapour pressure of the mixture is greater than that corresponding to an ideal solution.

Step-by-step Solution

Detailed explanation

Minimum Boiling Azeotropes :- Non-ideal solutions showing large positive deviation from Raoult's law form minimum boiling azeotropes which boil at temperature lower than boiling point of its components 'A' and 'B', e.g., water and benzene, chloroform and methanol. The Minimum…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match the following.

List - $I$		List - $II$
$(A)$	Addition polymer	$(I)$	Bakelite
$(B)$	Condensation polymer	$(II)$	$2$ -methyl- $1, 3$ -butadiene
$(C)$	Acrilan	$(III)$	$2, 3$ -dimethyl- $1, 3$ -butadiene
$(D)$	Rubber	$(IV)$	Vinyl cyanide
		$(V)$	Polythene

The correct answer is:

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