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.
Related Questions
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.
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.
Which of the following statements is true regarding the Ellingham diagram?
It shows the temperature dependence of the standard Gibbs free energy change for the formation of metal oxides.
It shows the pressure dependence of the standard Gibbs free energy change for the formation of metal oxides.
It shows the concentration dependence of the standard Gibbs free energy change for the formation of metal oxides.
It shows the entropy change for the formation of metal oxides.
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.
Ellingham diagrams are particularly useful for understanding the:
Reduction of metal oxides.
Oxidation of metals.
Neutralization reactions.
Solubility of salts.
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
AlโOโ
ZnO
FeO
Why does the vs. T curve for the formation of from have a negative slope in the Ellingham diagram?
Increase in entropy due to increase in gaseous moles.
Decrease in entropy due to decrease in gaseous moles.
Constant entropy as gaseous moles remain the same.
The reaction is exothermic.
In zone refining method, the molten zone :
contains impurities
contains puri๏ฌed metal only
contains more impurity than the original
moves to either side
The Ellingham diagram plots the change in which thermodynamic quantity against temperature?
Gibbs Free Energy
Enthalpy
Entropy
Internal Energy
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
