A) Iron from haematite
B) Aluminium from bauxite
C) Zinc from zinc blende
D) Mercury from cinnabar
Correct Answer: D
Solution :
In case of auto reduction no reducing agent is required. \[F{{e}_{2}}{{O}_{3}}+3CO\xrightarrow[{}]{{}}2Fe+3C{{O}_{2}}\] \[A{{l}_{2}}{{O}_{3}}\xrightarrow[{}]{Elctrolysis}Al\,at\,cathode\] \[\underset{zinc\,blende}{\mathop{2ZnS+3{{O}_{2}}}}\,\xrightarrow[{}]{{}}2ZnO+2S{{O}_{2}}\] \[\underset{\begin{smallmatrix} reducing \\ agent \end{smallmatrix}}{\mathop{ZnO+C}}\,\xrightarrow[{}]{{}}Zn+CO\] \[\underset{cinnabar}{\mathop{HgS+3{{O}_{2}}}}\,\xrightarrow[{}]{{}}2HgO+2S{{O}_{2}}\] \[2HgO\xrightarrow[{}]{\Delta }2Hg+{{O}_{2}}\]
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