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प्रश्न
Starting from hydrogen gas how would you obtain a metal by reduction of its heated oxide.
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उत्तर
Reduction of Fe2O3 (iron oxide) on heating to metal iron.
\[\ce{Fe2O3 + 3H2 ->\underset{\text{Reduced to metal}}{2Fe} + 3H2O}\]
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\[\ce{Fe3O4 + H2}\]
