CUET · CHEMISTRY · PYQ PAPER 2023

Which of the following is an example of a minimum boiling azeotrope?

A Phenol and aniline
B Chloroform and acetone
C Nitric acid and water
D Ethanol and acetone

Verified Solution

Answer & Solution

Correct Answer

(D) Ethanol and acetone

Step-by-step Solution

Detailed explanation

Ethanol and acetone

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 property given in List-l with the element given in List-Il

List-I (Property)	List-ll (Element)
(A) Lanthanoid, which can show +2 oxidation state	(I) Pm
(B) Radioactive lanthanoid	(II) Lu
(C) Lanthanoid which has \(4 f^{\wedge} 7\) electronic configuration in +3 oxidation state	(III) Eu
(D) Lanthanoid which has \(4 f^{\wedge}\{14\}\) electronic configuration in +3 oxidation state	(IV) Gd

Choose the correct answer from the options given below:

CUET 2025 Hard

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The demand function for a commodity is \(p=35-2 x-x^2\), then the consumer's surplus at equilibrium price \(p_0=20\) is

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Match List I with List II with regard to degree of the Differential Equation.

List - I	List - II
(A) \(\frac{d^3 y}{d x^3}+\sin y=0\)	(I) 4
(B) \(\left(\frac{d y}{d x}\right)^4+\cos \left(\frac{d y}{d x}\right)-1=0\)	(II) 1
(C) \(\left(\frac{d^2 y}{d x^2}\right)^2+\left(\frac{d y}{d x}\right)^4=0\)	(III) Not defined
(D) \(\left(\frac{d^2 y}{d x^2}\right)^5+2\left(\frac{d^3 y}{d x^3}\right)^4+7=0\)	(IV) 2

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Match List I with List II

LIST I	LIST II
A. \(\left( \frac{dy}{dx} \right)^2 + \frac{dy}{dx} + 5 = 0\)	I. order 3, degree 1
B. \(xy \frac{d^2y}{dx^2} + x \left( \frac{dy}{dx} \right)^2 - y \frac{dy}{dx} = 0\)	II. order 2, degree 2
C. \(\left( \frac{d^2y}{dx^2} \right)^2 + \frac{dy}{dx} = 0\)	III. order 2, degree 1
D. \(\frac{d^3y}{dx^3} + 2\frac{d^2y}{dx^2} + \frac{dy}{dx} = 0\)	IV. order 1, degree 2

Choose the correct answer from the options given below:

CUET 2023 Hard

The conductivity of 0.001 mol \(\text{L}^{-1}\) acetic acid is \(5.01 \times 10^{-5} \text{ S cm}^{-1}\).
Calculate its dissociation constant if \(\Lambda_m^{\circ}\) for acetic acid is
390.5 \(\text{S cm}^2 \text{mol}^{-1}\).

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