Read the Assertion and Reason below and choose the correct option. — Solid State Chemistry Question

💡 Solution & Explanation

In a Frenkel defect, an ion (usually the smaller cation) dislocates from its normal lattice site and occupies an interstitial site. Since no ions are lost from or added to the overall crystal structure, the mass and volume remain perfectly unchanged, meaning the density is unaffected. The Reason correctly explains the Assertion. Therefore, correct answer is A.