In a solid 'AB' having rock salt arrangement (NaCl structure), 'A' atoms occupy the corners and face center of the cubic unit cell. 'B' atoms occupies all octahedral voids of the unit cell. If all the face-centered

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Correct answer: D. A _ 3 B _ 4

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

In a solid 'AB' having rock salt arrangement (NaCl structure), 'A' atoms occupy the corners and face center of the

In a solid 'AB' having rock salt arrangement (NaCl structure), 'A' atoms occupy the corners and face center of the

Number of B atoms per unit cell

= \mathop{12 \times \dfrac{1}{4}}_{( edgecentred )} + \mathop{1 = 4}_{( bodycentred )}

Hence the resultant stoichiometry is

{A}_{3}{B}_{4}

In a solid 'AB' having rock salt arrangement (NaCl structure), 'A'...

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