Exams › JEE Advanced › Chemistry
In the Ellingham diagram, carbon-based reduction of a metal oxide M'O to give metal M' and the acidic oxide of carbon (CO2) becomes thermodynamically feasible above which temperature?
- 2100 K
- 2550 K
- 1300 K
- 600 K
Correct answer: 1300 K
Solution
The Ellingham diagram shows that the free energy line for C + O2 -> CO2 (which slopes upward positively) crosses below several metal oxide lines near 1300 K, making reduction of M'O by carbon to give M' and CO2 thermodynamically spontaneous above that temperature.
Related JEE Advanced Chemistry questions
- Sulfide ores are common for the metals -
- When Cu₂S is heated, which of the following substances produces copper metal?
- Galena, a lead ore, undergoes partial oxidation when air is passed through it at elevated temperatures. Afterward, air flow is stopped, and heating continues in a sealed furnace, allowing self-reduction to occur. What is the mass (in kg) of lead formed per kilogram of oxygen used? (Atomic masses in g/mol: O = 16, S = 32, Pb = 207)
- Identify the chemical compositions of calamine, malachite, magnetite, and cryolite in the correct sequence.
- A mixture of cations is treated with H2S gas in an acidic solution. Which group of cations will form insoluble sulfide precipitates under these conditions?
- Which of the following pairs of metals is correctly matched with its commercial extraction method?
⚔️ Practice JEE Advanced Chemistry free + battle 1v1 →