CUET · CHEMISTRY · PYQ PAPER 2023

Answer the question on the basis of passage given below :
Nitrogen differs from rest of the members of group 15 due to its small size, high electronegativity, high ionization enthalpy and non-availability of d orbitals. Nitrogen has unique ability to form pa - pa multiple bonds with itself and with other elements having small size and high electronegativity. Heavier elements of this group do not form pa - pr bonds as their atomic orbitals are so large and diffuse that they cannot have effective overlapping.
Planar structures with \(N - N\) single bond are shown by
A. \(N _2 O _3\)
B. \(N _2 O _4\)
C. \(N _2 O _5\)
D. \(N _2 O\)
E. \(NO\)
Choose the correct answer from the options given below:

A A and B only
B B and C only
C A and D only
D B and D only

Verified Solution

Answer & Solution

Correct Answer

(A) A and B only

Step-by-step Solution

Detailed explanation

\(N_2O_3\) and \(N_2O_4\) have planar structures with an \(N-N\) single bond. Correct option: A and B only

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.

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From CUET

Match List-I with List-II

List-I	List-II
(A) \(\int \frac{d x}{x^2-16}\)	(I) \(\frac{1}{8} \log \left\|\frac{4+x}{4-x}\right\|+c\)
(B) \(\int \frac{d x}{x^2+16}\)	(II) \(\log \left\|x+\sqrt{x^2-16}\right\|+c\)
(C) \(\int \frac{d x}{16-x^2}\)	(III) \(\frac{1}{8} \log \left\|\frac{x-4}{x+4}\right\|+c\)
(D) \(\int \frac{d x}{\sqrt{x^2-16}}\)	(IV) \(\frac{1}{4} \tan ^{-1}\left(\frac{x}{4}\right)+c\)

Choose the Correct answer from the options given below :

CUET 2025 Medium

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List-l (Metal)	List-II (Properties)
(A) \(Sc ^{3+}\)	(I) \(3 d^3\)
(B) \(Cr ^{3+}\)	(II) Colorless
(C) \(Cu ^{2+}\)	(III) \(3 d^8\)
(D) \(Ni ^{2+}\)	(IV) \(3 d^9\)