NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- Solid State
NTA Abhyas 2020 · Chemistry · Solid State
The spinel structure consists of an array of O^ 2 - ions in fcc...
The spinel structure consists of an array of ions in fcc arrangement. General formula of spinel is . Cations of A occupy 1/8th the tetrahedral voids and cations of B ions occupy half of the octahedral voids. If oxide ions are replaced by ions then number of an ionic vacancy per unit cell will be
Options
- A1
- B2
- C3
- D4
Correct answer
A. 1
Step-by-step solution
These are four ions in the unit cell; let these ions are replaced by n, ions.
Charge of ions = Charge of ions
4(-2) = n (-8/3)
n = 3 (i.e., there will one anionic vacancy)
Thus, there will be one an ionic vacancy per unit cell.
Charge of ions = Charge of ions
4(-2) = n (-8/3)
n = 3 (i.e., there will one anionic vacancy)
Thus, there will be one an ionic vacancy per unit cell.