Question
What chemical process is used for obtaining a metal from its oxide?
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Answer
- $(1)$ The oxide of low reactive metals, on heating forms metal by reduction (or self reduction) reaction.
- For example, $2 HgO ( s ) \stackrel{\text { Heat }}{\rightarrow} 2 Hg ( l )+ O _2(g)$
- $(2)$ The oxides of moderate reactive metals are reduced by carbon to metal.
- For example, $ZnO ( s )+ C ( s )$ Heat $\xrightarrow{\text { Heat }} Zn ( s )+ CO ( g )$
- $(3)$ The metals from oxide of highly reactive metals are obtained by electrolytic reduction process.
- For example, when the electrolysis of molten $NaCl$ solution is carried out, then, sodium metal is obtained at cathode.
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