Consider the following reaction at 1000ºC. (AIPMT 2006) I. - Zn(s)+ O (g) ZnO(s);ΔG°=-360KJmol → II. - C(gr)+ O (g) CO(g);ΔG°=-460KJmol → Choose the correct statement at 1000ºC

Here, for both the reactions, the change in free energy is negative i.e. the reactions are feasible. For the reduction reaction, if the reduction of zinc oxide is considered by carbon monoxide, the change will be +100 i.e. not feasible. However, if reduction of zinc oxide by graphite is considered, then the change in free energy is – 100 i.e. the process is feasible. Therefore, the correct answer is option (b) zinc oxide can be reduced by graphite.