Solid State Question 44
Question: $ MgO $ crystallizes in a cubic type crystal system. The ionic radii for $ M{{g}^{2+}} $ and $ {{O}^{2-}} $ are 0.066 and 0.140 nm respectively. One can conclude that the $ M{{g}^{2+}} $ ions occupy
Options:
A) a cubic hole in a simple cubic structure.
B) every tetrahedral hole in a close packed structure.
C) an octahedral hole in a cubic close packed structure.
D) every other tetrahedral hole in a close packed structure.
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ \frac{r _{c}}{r _{a}}=\frac{0.066}{0.140}=0.47 $ So, cation $ (M{{g}^{2+}}) $ fitted in octahedral holes of $ {{O}^{2-}} $ are present at fee lattice point.
BETA
