A) \[C{{u}^{2+}}(aq)+{{H}_{2}}(g)\xrightarrow{{}}Cu(s)+2{{H}^{+}}(aq)\]
B) \[C{{r}_{2}}{{O}_{3}}+2Al\xrightarrow{{}}A{{l}_{2}}{{O}_{3}}+2Cr\]
C) \[2A{{l}_{2}}{{O}_{3}}+3C\xrightarrow{{}}4Al+3C{{O}_{2}}\]
D) \[ZnO+C\xrightarrow{Coke,1673k}Zn+CO\]
Correct Answer: C
Solution :
| Hall-Herolut's process is given by: |
| \[2A{{l}_{2}}{{O}_{3}}+3C\xrightarrow[{}]{{}}4Al+3C{{O}_{2}}\] |
| \[2A{{l}_{2}}{{O}_{3}}(\ell )4A{{l}^{3+}}(\ell )+6{{O}^{2-}}(\ell )\] |
| At cathode: \[4A{{l}^{3+}}(\ell )+12{{e}^{-}}\xrightarrow[{}]{{}}4Al(\ell )\] |
| At anode: \[6{{O}^{2-}}(\ell )\xrightarrow[{}]{{}}3{{O}_{2}}(g)+12{{e}^{-}}\] |
| \[2C+3{{O}_{2}}\xrightarrow[{}]{{}}3C{{O}_{2}}(\uparrow ).\] |
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