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A metal oxide crystallises in a hexagona...

A metal oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by metal ions. The formula of metal oxide is

A

MO

B

`M_(3)O_(4)`

C

`M_(2)O_(6)`

D

`M_(2)O_(3)`

Text Solution

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The correct Answer is:
D
Unit cell of hcp structure = 6 number of oxide ions per unit cell = 6 number of octahedral voids = 6. Since, ferric ions occupy only two out of every three octahedral voids, number of octahedral holes occup
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