Chemistry - Solid State Question with Solution | TestHub

Question Explanation: Characteristics of F-centers and metal excess defects in crystals. Concepts Used: Metal excess defect, F-centers.

Solution:

(1) Na vapor deposits on the surface, ${\mathrm{Cl}}^{-}$diffuses out to react with Na . The electron from Na diffuses into the crystal to occupy the vacant anionic site. This is an F^-center. (A, B) are Correct.

2. The trapped electron is unpaired, leading to paramagnetism. (C) is Correct.

3. Density actually decreases or remains almost the same because Cl^- leaves the crystal, and theelectron adds negligible mass. (D) is Incorrect