BITSAT2020ChemistryGeneral Principles and Processes of Isolation of MetalsActual
_ f G ⁻ vs T plot in the Ellingham diagram slopes downward for the reaction
Options
- AMg + 1 2 O ₂ MgO
- B2 Ag + 1 2 O ₂ Ag ₂ O
- CC + 1 2 O ₂ CO
- DCO + 1 2 O ₂ CO ₂
Correct answer
C. C + 1 2 O ₂ CO
Step-by-step solution
C ( s )+ 1 2 O ₂( ~g ) CO ( g ) ; S increases. Hence, as the temperature increases, T S increases and hence G ( H - T S ) decreases. In other words, the slope of the curve for formation of CO decreases. However, for all other oxides, it increases.