A student writes the rusting reaction as \(Fe + H_2O \to Fe_2O_3 + H_2\). What is the most fundamental error in this statement?
Answer and explanation
Correct answer: Rusting requires both oxygen and water, and hydrogen gas is not produced.
Rusting is the slow oxidation of iron. It requires both oxygen and moisture, producing hydrated iron(III) oxide, \(Fe_2O_3\cdot xH_2O\). No \(H_2\) gas is evolved. Option B is incorrect because balancing coefficients cannot introduce the required \(O_2\) or remove the incorrect product \(H_2\).
Frequently asked questions
What is the correct answer to this question?
Rusting requires both oxygen and water, and hydrogen gas is not produced.
Why is this the correct answer?
Rusting is the slow oxidation of iron. It requires both oxygen and moisture, producing hydrated iron(III) oxide, \(Fe_2O_3\cdot xH_2O\). No \(H_2\) gas is evolved. Option B is incorrect because balancing coefficients cannot introduce the required \(O_2\) or remove the incorrect product \(H_2\).
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
