JEE Main · 2021 · 25 Feb 2021 · Shift 1 · General Principles and Processes of Isolation of Metals

Ellingham diagram is a graphical representation of:

(A) $Δ G$ vs $P$
(B) $Δ H$ vs $T$
(C) $(Δ G - T Δ S)$ vs $T$
(D) $Δ G$ vs $T$ ✓ Correct

Answer: (D)

Solution

An Ellingham diagram records how the standard free energy of formation of oxides changes with temperature, each line drawn for the same quantity of oxygen. Since

Δ G^{\circ} = Δ H^{\circ} - T Δ S^{\circ}

and both

Δ H^{\circ}

and

Δ S^{\circ}

vary little over a wide range, every line is nearly straight with slope

- Δ S^{\circ}

, and wherever one metal's line lies below another's that metal will reduce the other's oxide. The plot is thus of

Δ G

against

T

JEE Main · 2021 · 25 Feb 2021 · Shift 1 · Single correct option

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