JEE Main · 2019 · 08 Apr 2019 · Shift 1 · General Principles and Processes of Isolation of Metals

With respect to an ore, Ellingham diagram helps to predict the feasibility of its

(A)Electrolysis
(B)Thermal reduction✓ Correct
(C)Vapour phase refining
(D)Zone refining

Answer: (B)

Solution

An Ellingham diagram plots the standard free energy of oxide formation against temperature, and the relative heights of the lines show whether one element can strip oxygen from another's oxide. That is exactly what is needed to judge whether a reducing agent such as carbon, carbon monoxide or hydrogen can reduce a given ore at a chosen temperature, so the diagram predicts the feasibility of thermal reduction.

JEE Main · 2019 · 08 Apr 2019 · Shift 1 · Single correct option

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