In Ellingham diagrams of Δf G oxide formation V s T, which of the following graphs has negative slope?

Question

In Ellingham diagrams of Δf G oxide formation V s T, which of the following graphs has negative slope? (A) C arrow CO (B) Fe arrow Fe 2 O 3 (C) Mg arrow MgO (D) All of these

Tardigrade Admin · Accepted Answer

In Ellingham diagram the slope of C arrow CO is negative because entropy change is negative. Therefore, Δ G becomes more negative with increase in temperature.

Q. In Ellingham diagrams of $Δ_{f} G$ oxide formation $V s T$ , which of the following graphs has negative slope?

$C \to CO$

$F e \to F e_{2} O_{3}$

$M g \to M g O$

All of these

In Ellingham diagram the slope of $C \to CO$ is negative because entropy change is negative. Therefore, $Δ G$ becomes more negative with increase in temperature.

Q. In Ellingham diagrams of Δf​G oxide formation VsT, which of the following graphs has negative slope?

C→CO

Fe→Fe2​O3​

Mg→MgO