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According to the Ellingham diagram, which statement is true?
The standard enthalpy change of reduction is positive for all metal oxides.
The standard enthalpy change of reduction is negative for all metal oxides.
The standard enthalpy change of reduction is positive for some metal oxides.
The standard enthalpy change of reduction is negative for some metal oxides.
Answers (1)
The Ellingham diagram is a graphical representation that provides information about the standard enthalpy change of formation (ΔH°f) of metal oxides as a function of temperature. It helps in understanding the thermodynamic feasibility of reducing metal oxides to their respective metals.
On the Ellingham diagram, the vertical axis represents the standard Gibbs free energy change (ΔG°) or standard enthalpy change (ΔH°) of reduction, while the horizontal axis represents temperature.
Based on the Ellingham diagram, it is observed that the standard enthalpy change of reduction (ΔH°) is negative for some metal oxides. This indicates that the reduction of these metal oxides to their respective metals is thermodynamically favourable at a given temperature. In other words, these metal oxides can be reduced by a suitable reducing agent.
However, for other metal oxides, the standard enthalpy change of reduction (ΔH°) is positive, meaning that the reduction of these metal oxides is not thermodynamically favourable under standard conditions.
Therefore, the statement that is true according to the Ellingham diagram is that the standard enthalpy change of reduction is negative for some metal oxides (option 4).
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