The plot shows the variation of - In `K_p` versus temperature for the two reactions.
`M(s) + (1)/(2) O_2 (g) rarr MO (s) and C(s)+ (1)/(2) O_2(g) rarr CO(s)`

Identify the correct statement ,

Options

A. At `T lt 1200 K` oxidation of carbon is unfavourable.
B. Oxisation of carbon is favourable at all temperature.
C. At `T lt 1200` K, the reaction `MO(s) + C(s) rarr M(s) + CO(g)` is spontaneous.
D. At `T gt 1200 K,` carbon will reduce MO(s) to M(s) .

Answer

C

Explanation

Carbon is a good reducing agent for oxides. The reason why carbon reduces metal oxide spontaneously at `T lt 1200 K` is that - ln `K_p//T` line for CO has a negative slope.