A compound is formed by two elements A and B. The elements B forms cubic close packed structure and atoms of A occupy $$1 / 3$$ of tetrahedral voids. If the formula of the compound is $$\mathrm{A}_{x} \mathrm{B}_{y}$$, then the value of $$x+y$$ is in option
What fraction of one edge centred octahedral void lies in one unit cell of fcc?
Match List-I with List-II :
| List-I (Defects) |
List-II (Shown by) |
||
|---|---|---|---|
| (a) | Frenkel defect | (i) | Non-ionic solids and density of the solid decreases |
| (b) | Schottky defect | (ii) | Non-ionic solids and density of the solid increases |
| (c) | Vacancy defect | (iii) | Ionic solids and density of the solid decreases |
| (d) | Interstitial defect | (iv) | Ionic solids and density of the solid remains constant |
Choose the correct answer from the options given below :
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells.
Reason (R) : In an ionic solid, Frankel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality.
In the light of the above statements, choose the most appropriate answer from the options given below :