Statement I: Anion vacancies in alkali metal halides are produced by heating the alkali halide cryst — Solid State Chemistry Question

💡 Solution & Explanation

Statement I is correct: heating $NaCl$ in Na vapor results in chloride ions diffusing to the surface to form $NaCl$, creating anion vacancies in the crystal. Statement II is also correct: electrons released by Na atoms diffuse into the crystal and get trapped in these vacancies, forming F-centres. However, Statement II is not the direct explanation of Statement I.