Question

Assertion: The presence of a large number of Schottky defects in NaCl lowers its density.
Reason: In NaCl, there are approximately `10^(6)` Schottky pairs per `cm^(3)` at room temperature.
A. If both assertion and reason are true and the reason is the correct explanantion of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer 1

Correct Answer - B
When an atom or an ion is missing from its normal lattice site. Defect, due to missing density of crystal will be lowered.