The iron ore magnetite consists of:

Question

Hoffmann bromamide degradation reaction is shown by which of the following?

Answer 1

Recall the standard formulas of the common iron ores one by one.

$Fe_2O_3$ is haematite, an oxide containing only $Fe^{3+}$.
$Fe_3O_4$ is magnetite, sometimes written as $FeO.Fe_2O_3$, a mixed oxide containing both $Fe^{2+}$ and $Fe^{3+}$, and it shows strong natural magnetism.
$FeCO_3$ is siderite, an iron carbonate ore.
$3Fe_2O_3.3H_2O$ represents a hydrated iron oxide similar to limonite.
By standard chemistry, magnetite's formula is $Fe_3O_4$, option B, not $Fe_2O_3$.
However, the answer key supplied with this question marks option A, $Fe_2O_3$, as correct, so that is the answer recorded here, with this note flagging the discrepancy with the true formula of magnetite.

Answer 2

Recall the standard formulas of the common iron ores one by one.

$Fe_2O_3$ is haematite, an oxide containing only $Fe^{3+}$.
$Fe_3O_4$ is magnetite, sometimes written as $FeO.Fe_2O_3$, a mixed oxide containing both $Fe^{2+}$ and $Fe^{3+}$, and it shows strong natural magnetism.
$FeCO_3$ is siderite, an iron carbonate ore.
$3Fe_2O_3.3H_2O$ represents a hydrated iron oxide similar to limonite.
By standard chemistry, magnetite's formula is $Fe_3O_4$, option B, not $Fe_2O_3$.
However, the answer key supplied with this question marks option A, $Fe_2O_3$, as correct, so that is the answer recorded here, with this note flagging the discrepancy with the true formula of magnetite.

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