Solid State Question 196
Question: In a cubic structure of compound which is made from X and Y, where X atoms are at the corners of the cube and Y at the face centres of the cube. The molecular formula of the compound is
[AIIMS 2000]
Options:
A) $ X_2Y $
B) $ X_3Y $
C) $ XY_2 $
D) $ XY_3 $
Show Answer
Answer:
Correct Answer: D
Solution:
X atoms are at eight corners of the cube. Therefore, the number of X atoms in the unit cell $ =\frac{8}{8}=1 $ . Y atoms are at the face centre of six faces. Therefore, its share in the unit cell $ =\frac{6}{2}=3 $ . The formula is $ XY_3 $ .
BETA
