Chemistry - Metallurgy Question with Solution | TestHub

Ellingham diagram slope depends on entropy change (ΔS) of oxide formation reaction.

For C + O₂ → CO, gas moles decrease (1 mol O₂ → 1 mol CO), so slope should be positive, not negative.

Hence line I (negative slope) is incorrect.

For 2CO + O₂ → 2CO₂, gas moles decrease greatly, giving a positive slope, so line II is correct.

Therefore, the incorrect slope is only I.

Answer: (D) Only I