Question

A compound formed by elements $X$ and $Y$ crystallizes in a cubic structure in which the $X$ atoms are at the corners of a cube and the $Y$ atoms are at the face-centers. The formula of the compound is :-

• A. $XY$
• B. $XY_2$
• C. $X_2Y_3$
• D. $XY_3$

Answer 1

Answer: (D)

$XY_3$

Answer 2

No. of $X$ atoms (at the corners) $=\frac{1}{8}\times8=1$

No. of $Y$ atoms $\left(fcc\right)=6\times\frac{1}{2}=3$

Hence, the formula is $XY_3$.