Question 58

Ellingham diagrams are plots of $$\Delta G^0$$ vs temperature which have applications in metallurgy. 
$$2H_2 + O_2 \rightarrow 2H_2O$$,       $$\Delta G (J) = -247500 + 55.85T$$........ (I), 
$$2CO + O_2 \rightarrow 2CO_2$$,       $$\Delta G (J) = -282400 + 86.81T$$........ (II).
The Ellingham diagrams for the oxidation of $$H_2$$ (I) and CO (II) are given below and the two lines intersect at $$T_E = 1125$$ K.

image

Which of the following is correct?
I. $$\Delta G^0$$ for reaction (i) is more negative at $$T < 1125$$ K
II. $$\Delta G^0$$ for the reduction of CO is more negative at $$T < 1125$$ K
III. $$H_2$$ is a better reducing agent at $$T > 1125$$ K
IV. $$H_2$$ is a better reducing agent at $$T < 1125$$ K

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