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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

[IIT Screening 2001]


A

AB 2

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B

A2B

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C

A4B3

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D

A3B4

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Solution

The correct option is D

A3B4


There were 6 A atoms on the face-centres removing face-centred atoms

along one of the axes means removal of 2 A atoms.

Now, number of A atoms per unit cell

Number of B atoms per unit cell

Hence the resultant stoichiometry is A3B4


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