Question

Assertion (A): Schottky defect arises when a non-ionic solid is heated.
Reason (R): It happens because some of the lattice sites are vacant in the crystal.​

Answer 1

Explanation:

Assertion (A): Schottky defect arises when a non-ionic solid is heated. Reason (R): It happens because some of the lattice sites are vacant in the crystal. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. ... Assertion is true but Reason is false.

Answer 2

Assertion (A): Schottky defect arises when a non-ionic solid is heated.

Reason (R): It happens because some of the lattice sites are vacant in the crystal.​

In this both assertion and reason are true.

• Stoichiometric deficiencies are mostly in a crystal in which the ratio of anions to cations stays unchanged, as indicated by the molecular mass. Schottky deficiencies, Frenkel imperfections, and impurity deformities are the 3 kinds of stoichiometric deficiencies.

• Schottky defects occur when a similar amount of anions, as well as cations, are absent from the lattice sites in ionic crystals in order to maintain electroneutrality.
• Highly ionic bonds with high coordination numbers and cations as well as anions of comparable size are typical examples. Sodium chloride, potassium bromide, potassium chloride, and including cesium chloride are all common examples.
• Because the number of ions in a fixed volume reduces when a crystal has a Schottky defect, the compactness of the crystal tends to decrease. Additionally, when holes are produced with in crystal lattice, the crystal's stability and lattice energy drop.

Thus, we can say from the above statements that both the assertion and reason statements are true and the reason gives the correct explanation of the assertion.