CUET · CHEMISTRY · PYQ PAPER 2025

Select the correct statements about lanthanoids:
(A). Lanthanoids are good conductors of heat and electricity
(B). Ln oxides are used as phosphors in TV screens
(C). Their Melting points range between 2100 to 2300 K
(D). It is used for the production of alloy steels
Choose the correct answer from the options given below:

A (A), (B) and (D) only
B (A), (B) and (C) only
C (A), (C) and (D) only
D (B), (C) and (D) only

Verified Solution

Answer & Solution

Correct Answer

(A) (A), (B) and (D) only

Step-by-step Solution

Detailed explanation

Statements (A), (B), and (D) are correct. Option: (A), (B) and (D) 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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