In a solid 'AB' having the NaCl structure, 'A' atoms occupy the corners and face centres of the cubic unit cell, while 'B' atoms occupy the octahedral voids. If all the face-centred 'A' atoms along on

Question

In a solid 'AB' having the NaCl structure, 'A' atoms occupy the corners and face centres of the cubic unit cell, while 'B' atoms occupy the octahedral voids. If all the face-centred 'A' atoms along one of the principal axes are removed, the resultant stoichiometry of the solid is:

Prashant Kotian · Accepted Answer

Correct answer: D. Initially A is at corners () and faces (). Removing face-centered atoms along one axis removes exactly 2 face atoms, leaving 4. Remaining A at faces = . Total A = . B is in all octahedral voids (edges + body center), so total B = . The formula is .

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