Gaseous StateHard

Question

In a solid AB having the NaCl structure, ′A′ atom occupies the corners of the cubic unit cell. If all the face-centred atoms along one axis are removed, then the resultant stoichiometry of the solid is :

Options

A.AB2
B.A2B
C.A4B3
D.A3B4

Solution

Na in NaCl has 8 corner and 6 face atoms. If we remove face centred atom of one axis, two face atoms are removed. Thus A is at 8 corner and B is at 4 faces.
∴       A = = 1 and B = = 2
Thus formula is AB2

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