Schottky defect decreases the density of the substance.
Interstitial defect increases the density of the substance.
Frenkel defect does not alter the density of the substance.
Vacancy defect increases the density of the substance.
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The Correct Option isD
Solution and Explanation
The correct answer is (D) : Vacancy defect increases the density of the substance. When constituent particles occupy the interstitial location, interstitial defect arises. This increases the density of substance. Frenkel defect occurs when constituent particles occupy the interstitial site. It creates vacancy defect at original and interstitial defect at the new location. It does not change the density of crystal. Due to vacancy defect density of the substance will decrease.
Any irregularity in the pattern of crystal arrangement in a solid lattice is called imperfection in solids. The occurrence of defects takes place when crystallization (the process of formation of crystals) occurs at a very fast or at an intermediate rate.
Basically, defects fall out in two forms:
Point Defect
When the irregularities exist from the ideal arrangement around a point or an atom in solids, the defect is known as a point defect. Types of point defects are:
Stoichiometric defects
Non-stoichiometric defects
Impurity defects
Line Defect
When the deviation from the ideal arrangement exists in the entire row of lattice points, the defect is called line defect.
