For the following reactions, the standard free energy change is given at 1773 K as follows:
$$\frac{2}{3}$$ Cr₂O₂(s) = $$\frac{4}{3}$$ Cr(s) + O₂(g)
ΔG° = 447800 J
2H₂(g) + O₂(g) = 2H₂O(g)
ΔG° = - 297000 J
If chromium oxide powder has to be reduced by hydrogen in a fludised bed, the minimum $$\frac{{P{H_2}}}{{P{H_0}}}$$ ratio that has to be maintained at the exit of the reactor is

A. 8.5

B. 10.6

C. 100.2

D. 166.5

Answer: Option D