Ferric oxide crystallises in a hcp of oxide ions with two out of every tree octahedral voids occupied by ferric ions. Derive the formula of ferric oxide.

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Ferric oxide crystallises 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.

Q. Ferric oxide crystallizes in an hcp of

O^{2 -}

ions with two out of three octahedral voids (OVs) occupied by

F e^{3 +}

ions. The formula of the compound is

F e_{2} O_{3}

.
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Ferric oxide crystallizes in a hexagonal close packed structure of oxide,O^2- ions. Two out of every three octohedral holes are occupied by iron ions.what is the formula of ferric oxide?

Q. A certain oxide of metal

M

crystallises in such a way that

O^{2 -}

ions occupy hcp arrangement following

A B A B . . .

pattern. The metal ions, however, occupy

\frac{2}{3} r d

of the octahedral voids. The formula of the compound is

Q. In an ionic oxide, oxide ions are arranged in hcp array and positive ion occupy two thirds of octahedral voids. Suggest the formula assuming metal as M.

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