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General Principles and processes of Isolation of Elements
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Carbon reduction process is not commerically applicable for which of the following set of oxides to extract the respective metal ?
$(I)\,\,\,\,\,ZnO\,\,\,\,\,(II)\,\,\,\,\, Fe_2O_3\,\,\,\,\, (III)\,\,\,\,\, Al_2O_3\,\,\,\,\,(IV)\,\,\,\,\,SnO_2\,\,\,\,\,(V)\,\,\,\,\,MgO$
A
$ZnO, Fe_2O_3, SnO_2$
B
$ZnO, SnO_2, MgO$
C
$MgO, Al_2O_3$
D
$MgO, SnO_2, Al_2O_3$
Solution
Carbon reduction process is used to reduce less electropositive metals. $Mg$ and $Al$ have high electropositivity.
$MgO + C \xrightarrow[\text { at high temp }]{2000{ }^{\circ} C } Mg + CO$
It is possible at high temperatures, so it is not used for commercial purposes.
Hence, cannot be extracted from oxides through the carbon reduction process.
Standard 12
Chemistry
