CUET · CHEMISTRY · PYQ PAPER 2023

Match List - I with List - II
List - I List - II
(A) Impurity defect (I) NaCl with anionic sites called F centres
(B) Metal excess defect (II) FeO with Fe3+
(C) Metal deficiency defect (III) Non ionic solids and density of solid decreases
(D) Simple vacancy defect (IV) NaCl with Sr2+ and cationic sites vacant

Choose the correct answer from the options given below:

A (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
B (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
C (A)-(II), (B)-(I), (C)-(II), (D)-(IV)
D (A)-(I), (B)-(II), (C)-(IV), (D)-(III)

Verified Solution

Answer & Solution

Correct Answer

(B) (A)-(IV), (B)-(I), (C)-(II), (D)-(III)

Step-by-step Solution

Detailed explanation

(A) Impurity defect → (IV) NaCl with Sr2+ and cationic sites vacant (B) Metal excess defect → (I) NaCl with anionic sites called F centres (C) Metal deficiency defect → (II) FeO with Fe3+ (D) Simple vacancy defect → (III) Non ionic solids and density of solid…

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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List - I	List - II
(A) Impurity defect	(I) NaCl with anionic sites called F centres
(B) Metal excess defect	(II) FeO with Fe3+
(C) Metal deficiency defect	(III) Non ionic solids and density of solid decreases
(D) Simple vacancy defect	(IV) NaCl with Sr2+ and cationic sites vacant