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Ferric oxide crystallizes in a hexagonal...

Ferric oxide crystallizes in a hexagonal close packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.

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The correct Answer is:
(a) `Fe_(4)O_(6)` or `Fe_(2)O_(3)`, (b) `CaCl_(3)` or `Cdl_(2)`
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