An Ellingham diagram provides information about: 1. the condition of pH and potential under which a species is thermodynamically stable. 2. the standard Gibbs energies of formation of some metal oxides 3. the kinetics of the reduction process 4. standard electrode potentials of reduction reactions involved in the extraction of metals

JEE Main · 2020 · 05 Sep 2020 · Shift 1 · General Principles and Processes of Isolation of Metals

An Ellingham diagram provides information about:

the condition of pH and potential under which a species is thermodynamically stable.
the standard Gibbs energies of formation of some metal oxides
the kinetics of the reduction process
standard electrode potentials of reduction reactions involved in the extraction of metals

(A)1 and 2
(B)2 only✓ Correct
(C)1, 2 and 3
(D)2 and 4

Answer: (B)

Solution

An Ellingham diagram plots the standard Gibbs free energy of formation (

Δ G^{\circ}

) of metal oxides against temperature, so statement 2 is correct. It conveys no information about reaction kinetics (statement 3), electrode potentials (statement 4), or pH-potential stability (that is a Pourbaix diagram, statement 1). Only statement 2 is correct — option B.

JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Single correct option

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JEE Main · 2020 · 05 Sep 2020 · Shift 1 · General Principles and Processes of Isolation of Metals

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