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Question 900004
JEE Chemistry · Medium

Metallurgy and Qualitative Analysis: Ellingham diagram MCQ

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Ellingham diagramMediumQuestion 900004

Question

The Ellingham diagram plots ΔG° of oxide formation vs T. A metal can reduce another metal's oxide if:
  1. A
    Its oxide line (ΔG°) is lower (more negative) than the oxide to be reduced
    Correct
  2. B
    Its boiling point is lower
  3. C
    It is more abundant
  4. D
    Its oxide line is higher

Correct answer

Its oxide line (ΔG°) is lower (more negative) than the oxide to be reduced

Explanation

On the Ellingham diagram, if the ΔG° line of metal M is below the ΔG° line of metal oxide M'O, then M can reduce M'O. E.g., Al can reduce Fe₂O₃ (Al₂O₃ line is below Fe₂O₃ line at all temperatures).

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