Same chapter3 marksDifficulty: Medium
Name three methods of refining a crude metal and state where each is used.
General Principles and Processes of Isolation of Elements
3 marksDifficulty: Medium
What is an Ellingham diagram and what does it tell a metallurgist?
Original Khojo Papers practice question — not from a past board paper.
Answer
An Ellingham diagram plots the standard Gibbs energy of formation of oxides against temperature. The metal whose curve lies lower at a given temperature will reduce the oxide of any metal whose curve lies above it, so the diagram shows which reducing agent will work and at what temperature.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The point where the carbon monoxide line crosses a metal oxide line gives the temperature above which carbon can reduce that oxide.
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