Which of the following is NOT a limitation of the Ellingham diagram?
It doesn't show the effect of pressure on the reaction.
It assumes that the reactants and products are in their standard states.
It doesn't provide information about the kinetics of the reaction.
It doesn't account for the formation of solutions between metals and oxides.
Related Questions
For the reaction , the Ellingham diagram shows a negative slope. This is primarily because:
The number of gaseous molecules increases during the reaction.
The reaction is exothermic.
Carbon is a good reducing agent.
Carbon monoxide is a stable gas.
In an Ellingham diagram, a reaction with a negative slope indicates:
The reaction becomes more spontaneous at higher temperatures.
The reaction becomes less spontaneous at higher temperatures.
The reaction is independent of temperature.
The entropy change is zero.
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.
Consider the Ellingham diagram. Which metal oxide among the following can be reduced by coke at a temperature of 1500 K but not at 1200 K?
MgO
Al₂O₃
ZnO
FeO
Using the Ellingham diagram, predict the approximate temperature above which magnesium can reduce alumina ().
1000°C
1600°C
2000°C
2500°C
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.
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
What does a line with a positive slope on an Ellingham diagram represent?
An increase in entropy
A decrease in entropy
An increase in enthalpy
A decrease in enthalpy
The Ellingham diagram suggests that the reduction of alumina () by magnesium (Mg) is feasible. Which of the following statements best explains this feasibility?
The Gibbs free energy change for the overall reaction is positive.
The enthalpy change for the reaction is positive.
The entropy change for the reaction is negative.
The Gibbs free energy change for the overall reaction is negative.
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
