Which of the following is true about iron oxides?....

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Which of the following is true about iron oxides?
(1) Ferric oxide is the only higher oxide formed by iron.
P
In an acidic solution, ferrate \( \mathrm{FeO}_{4}^{2-} \) are formed which are very stable.
(3) In an alkaline medium, ferrates are formed which are very unstable and decompose to \( \mathrm{Fe}_{3} \mathrm{O}_{4} \).
(4) All are true.


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