The Ellingham diagram for the formation of metal oxides shows a sudden increase in the slope for some metals. This is primarily due to:
Melting of the metal
Boiling of the metal
Phase transition of the metal
Formation of a non-stoichiometric oxide
Related Questions
Which of the following statements is INCORRECT regarding the Ellingham diagram?
The Ellingham diagram plots Gibbs free energy change as a function of temperature.
The Ellingham diagram assumes all reactants and products are in their standard states.
The Ellingham diagram can be used to determine the rate of a reaction.
The slope of the lines in the Ellingham diagram is determined by the entropy change of the reaction.
A sudden change in the slope of a line in an Ellingham diagram indicates:
A phase change in the metal or its oxide.
A change in the reaction mechanism.
A change in pressure.
A change in concentration.
The Ellingham diagram for the formation of metal oxides shows a sudden change in slope for some metals. This is due to:
Phase transition of the metal.
Change in the oxidation state of the metal.
Formation of a non-stoichiometric oxide.
Change in the partial pressure of oxygen.
In an Ellingham diagram, a line with a more negative slope than another indicates:
A larger increase in entropy during the reaction.
A smaller increase in entropy during the reaction.
A more negative enthalpy change for the reaction.
A less negative enthalpy change for the reaction.
In an Ellingham diagram, the slope of the line for the formation of a metal oxide is positive. This indicates that:
The entropy change for the reaction is negative.
The reaction becomes less spontaneous at higher temperatures.
The free energy change becomes more negative at higher temperatures.
The enthalpy change for the reaction is positive.
In zone refining method, the molten zone :
contains impurities
contains purified metal only
contains more impurity than the original
moves to either side
Which metal, among the following, has the greatest potential to reduce alumina () based on the Ellingham diagram, considering the most negative Gibbs free energy change for the overall reduction process?
Mg
Fe
Zn
Ca
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
Using the Ellingham diagram, predict the approximate temperature above which magnesium can reduce alumina ().
1000°C
1600°C
2000°C
2500°C
