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A student wrote \(\mathrm{Fe + H_2O \rightarrow FeO + H_2}\) for the reaction of iron with steam. What is the main error in this equation?

Answer and explanation

Correct answer: The formula of the iron oxide product is incorrect; hot iron reacts with steam to form mainly \(\mathrm{Fe_3O_4}\).

When steam is passed over hot iron, magnetite, \(\mathrm{Fe_3O_4}\), and hydrogen are formed. The correct balanced equation is \(\mathrm{3Fe + 4H_2O \rightarrow Fe_3O_4 + 4H_2}\). Therefore, writing \(\mathrm{FeO}\) as the product is incorrect. Unlike option B, hydrogen from steam is released as hydrogen gas.

Related tags

Chemical ReactionsChemical EquationsIron Steam ReactionMagnetiteBalanced EquationsClass 10 Science

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