At the temperature corresponding to which of the points in Fig. `FeO` will be reduced to Fe by coupling the reaction `2Fe rarr 2Fe +O_(2)` with all of the following reactions?
(a) `C + O_(2) rarr CO_(2)` (b) `2C +O_(2) rarr 2CO` and (c) `2CO +O_(2) rarr 2CO_(2)`

Options

A. Point A
B. Point B
C. Point D
D. Point E

Answer

B, D

Explanation

At points B and E, ` Delta _ f G ^(@) ""_((C, CO _ 2)) , Delta _ f G ^(@) ""_((CO,CO_2)), Delta _f G ^(@) ""_((C,CO)) ` curves all lie below ` Delta_f G ^(@)""_((Fe, FeO )) ` curve, therefore, at points B and E, FeO will be reduced to Fe by all the three reactions , i.e., options (b) and (d) are correct.