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Which one of the following oxides is reduced by water gas to obtain the metal during its extraction?
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Verified Answer
The correct answer is:
$\mathrm{WO}_3$
Nickel oxide is reduced by water gas to obtain the metal. Other oxides are reduced by other reducing agent.
$\begin{gathered}
\mathrm{ZnO}+\mathrm{C} \stackrel{\Delta}{\longrightarrow} \mathrm{Zn}+\mathrm{CO} \\
\mathrm{WO}_3+3 \mathrm{H}_2 \stackrel{\Delta}{\longrightarrow} \mathrm{W}+3 \mathrm{H}_2 \mathrm{O} \\
\mathrm{Fe}_2 \mathrm{O}_3+3 \mathrm{CO} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Fe}+3 \mathrm{CO}_2 \\
2 \mathrm{NiO}+\underbrace{\mathrm{CO}+\mathrm{H}_2}_{\text {Water gas }} \longrightarrow 2 \mathrm{Ni}+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}
\end{gathered}$
$\begin{gathered}
\mathrm{ZnO}+\mathrm{C} \stackrel{\Delta}{\longrightarrow} \mathrm{Zn}+\mathrm{CO} \\
\mathrm{WO}_3+3 \mathrm{H}_2 \stackrel{\Delta}{\longrightarrow} \mathrm{W}+3 \mathrm{H}_2 \mathrm{O} \\
\mathrm{Fe}_2 \mathrm{O}_3+3 \mathrm{CO} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Fe}+3 \mathrm{CO}_2 \\
2 \mathrm{NiO}+\underbrace{\mathrm{CO}+\mathrm{H}_2}_{\text {Water gas }} \longrightarrow 2 \mathrm{Ni}+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}
\end{gathered}$
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