Class 12

Chemistry

Gases & Solutions

States of Matter

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

- $XY_{3}$
- $X_{3}Y$
- $XY$
- $XY_{2}$

Y-atoms at the face centres $=21 ×6=3$

Ratio of X and Y = 1 : 3

Hence, formula is $XY_{3}$.