1.

At the points of intersection of `Al_(2)O_(3)` and MgO curves (A), `DeltaG^(@)` becomes zero for reaction, `(2)/(3)Al_(2)O_(3) + 2Mg to 2MgO + 4/3 Al` Above this point, magnesium can reduce alumina. Although thermodynamically feasible, Mg is not used to reduction of `Al_(2)O_(3)` becauseA. temperature required is very highB. the yield of metal is very lowC. value of `DeltaG` becomes positiveD. magnesium is not used as reducing agent for any reaction.

Answer» Correct Answer - A
Temperature above the point of intersection of `Al_(2)O_(3)` and MgO to reduce `Al_(2)O_(3)` but the temperature required would be so high that the process is difficult to carry out.


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