Ellingham diagram is a graphical representation of:

1. $∆H<mspace\; width="1em"></mspace>vs<mspace\; width="1em"></mspace>T$

2. $∆G<mspace\; width="1em"></mspace>vs<mspace\; width="1em"></mspace>T$

3. $∆G<mspace\; width="1em"></mspace>vs<mspace\; width="1em"></mspace>P$

4. $(∆G-T∆S)$

An Ellingham diagram provides information about:

With respect to an ore, the Ellingham diagram helps to predict the feasibility of its-

1. Electrolysis
2. Thermal reduction
3. Zone refining
4. Vapour phase refining

Consider the following reactions at  1100^oC 

\((I)\,\, 2 \mathrm{C}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{CO}, \Delta G^{\circ}=-460 \mathrm{~kJ} \mathrm{~mol}^{-1}\\ (II)\,\, 2 \mathrm{Zn}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{ZnO}, \Delta G^{\circ}=-360 \mathrm{~kJ} \mathrm{~mol}^{-1}\)

Based on these, select correct alternate : 

1. Zinc can be oxidised by CO. 

2. Zinc oxide can be reduced by carbon. 

3. Both 1 and 2. 

4. None is correct.