Question

In a solid, AB having the NaCl structure, A atoms occupy the corners of the cubic unit cell. If all the face centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

Answer 1

Na in NaCl has 8 corners and 6 face atoms. If we remove face centered atom of one axis , two face atoms are removed.
Thus A is at 8 corners and B is at 4 faces.
∴A=88=1∴A=88=1
⇒B=42=2⇒B=42=2
Thus formula is AB2AB2
Hence answer is (a)