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JEE Main 202126 AugustMorning Shift
Exam
JEE Main
Year
2021
Date
26 August
Shift
Morning Shift
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

JEE Main 2021 · 26 August · Morning Shift · Chemistry · General Principles and Processes of Isolation of Metals

Given below are two statements. Statement I: The choice of reducing...

Given below are two statements.
Statement I: The choice of reducing agents for metals extraction can be made by using the Ellingham diagram, a plot of \DeltaG\DeltaG vs temperature.
Statement II: The value of ΔS\Delta S increases from left to right in the Ellingham diagram.

In the light of the above statements, choose the most appropriate answer from the options given below:

Options

  1. AStatement I is false but Statement II is true
  2. BBoth Statement I and Statement II are true
  3. CStatement I is true but Statement II is false
  4. DBoth Statenent I and Statement II are false

Correct answer

C. Statement I is true but Statement II is false

Step-by-step solution

Ellingham diagram was a curve that related the Gibbs energy value with the temperature. Ellingham diagram is used to check which metal oxide is reduced by which compound.

ΔG=ΔH−TΔS\Delta G = \Delta H - T \Delta S

The slope of the curve is −∆S- ∆ S

Since the slope of the curve is positive, thus the ∆S∆ S is negative. So the value of ∆S∆ S decreases left to right.

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