$A$ body-centred cubic $(BCC)$ lattice is made up of two different types of atoms $X$ and $Y$. Atom $X$ occupies the body centre and atoms $Y$ occupy the corner positions. One of the corners is left unoccupied per unit cell. The empirical formula of it is
- A$X_2 Y_3$
- B$X_8 Y_7$
- C$X_7 Y_8$
- D$X_5 Y_7$
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