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General Principles and processes of Isolation of Elements
medium
હૉલ - હેરાઉલ્ટ પ્રક્રમ કઈ રીતે આપવામાં આવે છે ?
A
$Cu^{2+} (aq) +H_2 (g)$ $\longrightarrow$ $Cu (s) + 2H^+ (aq)$
B
$Cr_2O_3 + 2Al$ $\longrightarrow$ $Al_2O_3 + 2Cr$
C
$2Al_2O_3 + 3C$ $\longrightarrow$ $4Al + 3CO_2$
D
$ZnO + C\xrightarrow{{Coke,\,1673\,K}}Zn + CO$
(JEE MAIN-2019)
Solution
Hall – Herolut's process is given by
$2A{l_2}{O_3}\, + \,\,3C\, \to \,4Al\, + \,3C{O_2}$
$2A{l_2}C{O_3}(l)\, \rightleftharpoons \,4A{l^{3 + }}(l)\, + \,6{O^{2 – }}(l)$
At Cathode : $4A{l^{3 + }}(l)\, + \,12{e^ – }\, \to \,4Al\,(l)$
At anode : $6{O^{2 – }}(l) \to \,3{O_2}(g)\, + \,12{e^ – }\,$
$2C\, + \,3{O_2} \to 3C{O_2}( \uparrow )$
Standard 12
Chemistry
