Question

Assertion: No compound has both Schottky and Frenkel defects.
Reason: Both defects change the density of the solid.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
• B. If both Assertion and Reason are true but the reason is not the correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If both Assertion and Reason are false

Answer 1

Answer: (D)

Certain ionic solids (for example, $AgBr$ ) have both Schottky and Frenkel defects. Only Schottky defects change the density of solids because anions or cations are missing and Frenkel defects have no change in density because they have same number of cations or anions, only change the position of ions.