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.
Related Questions
According to the Ellingham diagram, which of the following metals cannot be used to reduce alumina ()?
Mg
Ca
Cu
Na
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.
Based on the Ellingham diagram, which metal is the most suitable reducing agent for alumina () at a temperature of 1000°C?
Zn
Fe
Mg
Cu
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.
The Ellingham diagram does NOT directly account for which of the following factors that can influence the feasibility of a reduction reaction?
Temperature
Partial pressure of gases involved
Kinetics of the reaction
Entropy change of the reaction
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
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 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
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.
