Why is the chemical formula of iron oxide Fe 3 O 4 when the valency of iron is 2-3 and that of oxygen is 2

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Standard X

Chemistry

Classification of Modern Periodic Table

Why is the ch...

Question

Why is the chemical formula of iron oxide Fe₃O₄ when the valency of iron is 2,3 and that of oxygen is 2

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Solution

Fe3O4 can be thought of as a mixture of both compounds in equal amounts. So Fe3O4 contains both Fe(II) and Fe(III) ions; twice as much Fe(III) as Fe(II).

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Q. Iron (III) oxide is a chemical compound found in haemtitie, an iron ore.

Give the formulae of all the irons in iron (III) oxide.

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Iron+Oxygen+Moisture = Iron Oxide

Why is the valency of iron is 2 and 3 ..?

Why is CuSO₄the expected formula of Copper Sulphate and not Cu₂SO₄ when Copper has variable valency of Cu⁺ and Cu²⁺ ; Here the higher valency is used for the salt.

However in the case of Iron Sulphate the expected formula is FeSO₄ and not Fe₂(SO₄)₃ eventhough Iron also has variable valency of Fe²⁺ and Fe³⁺ ; Here the lesser valency is used for the salt.

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Why is the chemical formula of iron oxide Fe3O4 when the valency of iron is 2,3 and that of oxygen is 2

Fe3O4 can be thought of as a mixture of both compounds in equal amounts. So Fe3O4 contains both Fe(II) and Fe(III) ions; twice as much Fe(III) as Fe(II).

Why is the chemical formula of iron oxide Fe₃O₄ when the valency of iron is 2,3 and that of oxygen is 2