Given below are two statements related to Ellingham diagram: Statement-I : Ellingham diagrams can be constructed for formation of oxides, sulfides and halides of metals. Statement-II : It consists of plots of $\Delta_{\mathrm{f}} \mathrm{H}^{0}$ vs T for formation of oxides of elements. In the light of the above statements, choose the most appropriate answer from the options given below:

(A) Both Statement I and Statement II are incorrect

(B) Statement I is incorrect but Statement II is correct

(C) Both Statement I and Statement II are correct

JEE Main · 2023 · 13 Apr 2023 · Shift 2 · General Principles and Processes of Isolation of Metals

Given below are two statements related to Ellingham diagram:
Statement-I : Ellingham diagrams can be constructed for formation of oxides, sulfides and halides of metals.
Statement-II : It consists of plots of

Δ_{f} H^{0}

vs T for formation of oxides of elements.
In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both Statement I and Statement II are incorrect
(B)Statement I is incorrect but Statement II is correct
(C)Both Statement I and Statement II are correct
(D)Statement I is correct but Statement II is incorrect✓ Correct

Answer: (D)

Solution

An Ellingham diagram is a plot of the standard free energy of formation of a compound against temperature, and such diagrams can be constructed not only for oxides but also for the sulfides and halides of metals, which makes Statement I correct. The quantity plotted on the vertical axis is the standard Gibbs free energy of formation,

Δ_{f} G^{\circ}

, and not the standard enthalpy of formation,

Δ_{f} H^{\circ}

; it is the sign of

Δ G^{\circ}

that decides whether a reduction becomes feasible at a given temperature. Statement II, which names the enthalpy of formation, is therefore incorrect, so Statement I is correct but Statement II is incorrect.

JEE Main · 2023 · 13 Apr 2023 · Shift 2 · Single correct option

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JEE Main · 2023 · 13 Apr 2023 · Shift 2 · General Principles and Processes of Isolation of Metals

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