SATHEE: Extraction of Metals - Result Question 9

Extraction of Metals - Result Question 9

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

(2019 Main, 8 April I)

(a) electrolysis

(b) zone refining

(d) thermal reduction

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Solution:

With respect to an ore, Ellingham diagram helps to predict the feasibility of its thermal reduction. It is a graph representation of Gibbs energy change versus absolute temperature.

Gibbs energy $(Δ G^{\circ})$ versus $T$ plots (schematic) for the formation of some oxides (Ellingham diagram)

Generally, the diagram consists of plots of $Δ G^{\circ}$ versus $T$ for the formation of oxides of elements

$2 x M (s) + O_{2} (g) ⟶ \underset{Thermal reduction product}{2 M_{x} O (s)}$

In this reaction, amount of gas decreases thus, randomness decreases. Hence, $Δ S$ becomes negative. Therefore, the value of free energy increases with increase in temperature. There is a point in a curve below which $Δ G$ is negative. So, $M_{x} O$ is stable. Above this point, $M_{x} O$ will decompose on its own.

Extraction of Metals - Result Question 9

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

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Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Extraction of Metals - Result Question 9

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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