Assertion: The presence of a large number of Schottky defects in NaCl lowers its density. Reason: In NaCl, there are approximately 106 Schottky pairs per cm3 at room temperature.

Question

Assertion: The presence of a large number of Schottky defects in NaCl lowers its density. Reason: In NaCl, there are approximately 106 Schottky pairs per cm3 at room temperature. (A) If both assertion and reason are true and reason is the correct explanation of assertion. (B) If both assertion and reason are true but reason is not the correct explanation of assertion. (C) If assertion is true but reason is false. (D) If both assertion and reason are false.

Tardigrade Admin · Accepted Answer

When an atom or an ion is missing from its normal lattice site, a lattice vacancy or defect is created, which is called Schottky defect. Due to missing density of crystal will be lowered.

Q. Assertion: The presence of a large number of Schottky defects in NaCl lowers its density. Reason: In NaCl, there are approximately 106 Schottky pairs per cm3 at room temperature.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

When an atom or an ion is missing from its normal lattice site, a lattice vacancy or defect is created, which is called Schottky defect. Due to missing density of crystal will be lowered.

Q. Assertion: The presence of a large number of Schottky defects in $N a Cl$ lowers its density.
Reason: In NaCl, there are approximately $1 0^{6}$ Schottky pairs per $c m^{3}$ at room temperature.