CUET · CHEMISTRY · PYQ PAPER 2023

Assuming \(\text{[NiCl}_4\text{]}^{2-}\) as Complex-A and \(\text{[Ni(CO)}_4\text{]}\) as Complex-B, choose the correct statement.
(Atomic number of Ni = 28)

A State of hybridization of Ni in Complex-A is \(\text{dsp}^2\) and in Complex-B is \(\text{sp}^3\).
B Complex-A is paramagnetic and Complex-B is diamagnetic.
C Oxidation state of Ni in both complexes is + 2.
D \(\text{CO}\) is a weaker ligand than \(\text{Cl}^-\).

Verified Solution

Answer & Solution

Correct Answer

(B) Complex-A is paramagnetic and Complex-B is diamagnetic.

Step-by-step Solution

Detailed explanation

No Solution

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 List-l with List-II

List-I(Concentration term)	List-II(Formula)
(A) Mass percentage	(I) \(\frac{\text { Volume of solute }}{\text { Volume of solution }} \times 100\)
(B) Volume percentage	(II)\(\frac{\text {Moles of a component}}{\text {Total moles of all the components } \mathrm{}}\)
(C) Mole Fraction	(III) \(\frac{\text { Moles of solute }}{\text { Mass of solvent in } \mathrm{kg}}\)
(D) Molality	(IV) \(\frac{\text { Mass of solute }}{\text { Volume of solution × Density of solution }} \times 100\)

Choose the correct answer from the options given below:

CUET 2025 Medium

Choose the incorrect statement from the following:

CUET 2023 Easy

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List-I (Name of the Base)	List-II (Structure)
(A). Adenine (A)	(I).
(B). Cytosine (C)	(II).
(C). Thymine (T)	(III).
(D). Guanine (G)	(IV).

Assuming \(\text{[NiCl}_4\text{]}^{2-}\) as Complex-A and \(\text{[Ni(CO)}_4\text{]}\) as Complex-B, choose the correct statement.(Atomic number of Ni = 28)

Step-by-step Solution

Assuming \(\text{[NiCl}_4\text{]}^{2-}\) as Complex-A and \(\text{[Ni(CO)}_4\text{]}\) as Complex-B, choose the correct statement.
(Atomic number of Ni = 28)