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Question

A solid AB has the NaCl structure, and A atoms occupy the corners of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant formula of the of the unit cell of the solid will be:

A
AB2
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B
A2B
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C
A3B4
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D
A4B3
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Solution

The correct option is C A3B4

NaCl structure A occupies all the corners and face centred.
B occupies all edge centres and bodycentred.
A(8×18+6×12)B(12×14+1)=A4B4
When face-centred atoms along an axis are removed; 2 atoms of A will be removed.
A(8×18+4×12)B4A3B4


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