NEET · Chemistry · STD 12 - 4. d and f- block elements

The pair of lanthanoid ions which are diamagnetic is

A \(\mathrm{Ce}^{3+}\) and \(\mathrm{Eu}^{2+}\)
B \(\mathrm{Gd}^{3+}\) and \(\mathrm{Eu}^{3+}\)
C \(\mathrm{Pm}^{3+}\) and \(\mathrm{Sm}^{3+}\)
D \(\mathrm{Ce}^{4+}\) and \(\mathrm{Yb}^{2+}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(\mathrm{Ce}^{4+}\) and \(\mathrm{Yb}^{2+}\)

Step-by-step Solution

Detailed explanation

Magnetic moment \(\mu=\sqrt{n(n+2)}\) \(\mathrm{n} \rightarrow\) number of unpaired electron

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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Match List \(I\) with List \(II\) related to digestive system of cockroach.

List \(I\)	List \(II\)
(A) The structures used for storing of food	(I) Gizzard
(B) Ring of \(6-8\) blind tubules at junction of foregut and midgut.	(II) Gastric Caeca
(C) Ring of \(100-150\) yellow coloured thin filaments at junction of midgut and hindgut.	(III) Malpighian tubules
(D) The structures used for grinding the food.	(IV) Crop

Choose the correct answer from the options given below:

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