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Question

In a binary compound, atoms of element A form a hcp structure and those of elements M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

A
M4A
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B
MA3
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C
M2A3
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D
M4A3
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Solution

The correct option is D M4A3
Number of atom in hcp unit cell = 6
So, A=6
Total number of tetrahedral void in hcp unit cell = 12
M=23×12=8

Thus, the formula of the binary compound would be A6M8
A3M4
or M4A3
Hence, option (b) is correct answer.

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