MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Schottky defect is a type of point defect in a crystal lattice that occurs when an equal number of cations and anions are missing from their lattice sites. Since equal numbers of oppositely charged ions are missing, the stoichiometry and electrical neutrality of the crystal are maintained. Because it involves missing ions, it is a vacancy defect. Due to the loss of ions from the crystal lattice, the mass of the crystal decreases while its volume remains the same. Therefore, the density of the crystal decreases. Thus, the statement that the density of the crystal remains unchanged is incorrect. Answer: After defect density of crystal remains unchanged