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Question

A substance AxBy crystallizes in a face - centred cubic lattice in which atoms A occupy the centres of each face of the cube. Identify the correct composition of the substance AxBy.


A

AB3

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B

A4B3

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C

A3B

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D

Cannot be specified

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Solution

The correct option is C

A3B


AxBy FCC, A centres of each face
No. of A atoms =12×6=3
B all corners
No. of B atoms =18×8=1
Formula A3B


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