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Ferric oxide crystallises in a hexagonal...

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.

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`Fe_2O_3 + H_2 overset(573K) 2FeO + H_2O`
Properties: (a) It is insoluble in water.
(b) It is black coloured powder.
( c) It is a basic oxide and dissolves in acids to form ferrous salts.
`FeO(s) + H_2SO_4(aq) rarr FeSO_4(aq) + H_2O`
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