Chemistry - Solid State Question with Solution | TestHub

(P) Interstitial defect $\to$ (3) Density increases: Atoms occupy empty interstitial spaces, increasing the crystal mass without changing its volume.

(Q) Schottky defect $\to$ (1) Stoichiometric defect: Equal numbers of cations and anions are missing, maintaining the exact chemical formula ratio.

(R) Frenkel defect $\to$ (4) Dislocation defect: Ions (usually smaller cations) are simply dislocated from their original lattice sites to interstitial sites.

(S) Metal deficiency defect $\to$ (2) Non-stoichiometric defect: The crystal contains fewer metal cations than anions, altering the ideal chemical ratio.

Correct Answer: (D) P $\to$ 3; Q $\to$ 1; R $\to$ 4; S $\to$ 2