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JEE Main202126 Aug 2021Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

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 Δ G vs temperature. Statement II: The value of ΔS 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 The slope of the curve is - ∆ S Since the slope of the curve is positive, thus the ∆ S is negative. So the value of ∆ S decreases left to right.

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