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General Principles and processes of Isolation of Elements
medium
Carbon cannot be used in the reduction of $Al_2O_3$ because :
A
it is an expensive proposition
B
the enthalpy of formation of $CO_2$ is more than that of $Al_2O_3$
C
pure carbon is not easily available
D
the enthalpy of formation of $Al_2O_3$ is too high.
Solution
Very high temperatures around $2100$ degree celcius is required for the carbothermic reduction.
Aluminium Oxide is a very stable oxide and lies below the the oxidation line of carbon in Ellingham Diagram hence $Al _2 O _3$ cannot be reduced by carbon as it is energetically not favourable.
Standard 12
Chemistry
Similar Questions
Match List $I$ with List $II$ and select the correct answer using the codes given below the list
| List $I$ | List $II$ | ||
| $1.$ | $Ti$ | $A.$ | Bauxite |
| $2.$ | $Si$ | $B.$ | Cerussite |
| $3.$ | $Al$ | $C.$ | Van-Arkel method |
| $4.$ | $Pb$ | $D.$ | Zone refining |
