In a face centred cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms at the face centres. Once of the A atom is missing from one corner in unit cell. The simplest formula of compound is

Answer

B

Explanation

No. of A atoms at the corners = `7 xx 1/8 = 7/8`
No. of B atoms at face centres = `6 xx 1/2 = 3`
Ratio of `A : B = 7/8 : 3`.
Formula of compound is `A_7 B_(24)`.