Which gas is evolved when iron and water react?

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Accepted Answer

Step-by-step explanation:

1. When iron reacts with water (especially steam) the iron is oxidized and water is reduced, producing iron oxide and hydrogen gas.
2. The balanced reaction with steam is: $3\mathrm{Fe} + 4\mathrm{H_2O} \xrightarrow{	ext{steam}} \mathrm{Fe_3O_4} + 4\mathrm{H_2}$, which clearly shows $\mathrm{H_2}$ (hydrogen) being evolved.
3. Therefore among the options given, (1) Hydrogen is the correct gas produced.

FINAL_ANSWER: a

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