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A substance A(X) B(Y) crystallises in a...

A substance `A_(X) B_(Y)` crystallises in a face centred cubic (fcc) lattice in which atoms ‘A’ occupy each corner of the cube and atoms ‘B’ occupy the centres of each face of the cube. Identify the correct composition of the substance `A_(X) B_(Y)` :

A

`AB_(3)`

B

`A_(4)B_(3)`

C

`A_(3)B`

D

Composition cannot be specified

Text Solution

Verified by Experts

The correct Answer is:
A
A occupies corner, so the contribution to unit cell is of one atom whereas B at face centered the contribution to six faces shared between two is 3.
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