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Question

In a fcc lattice, A, B, C and D atoms are arranged at corner, face center, octahedral void and tetrahedral void respectively, then the body diagonal contains :

A
2A, C, 2D
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B
2A, 2B, 2C
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C
2A, 2B, D
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D
2A, 2D
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Solution

The correct option is A 2A, C, 2D
In fcc, along the body diagonal, 2 tetrahedral voids and one octahedral void at body center is present. So, a body diagonal contains 2A, C and 2D.

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