Solid State - Result Question 21
####21. Which of the following fcc structure contains cations in alternate tetrahedral voids?
(2005, 1M)
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 21. (b)
Solution:
- In
(sulphide ions) are present at fcc positions giving four sulphide ions per unit cell. To comply with stoichiometry, four ions must be present in four alternate tetrahedral voids out of eight tetrahedral voids present.
In