Advertisements
Advertisements
Question
Why is zinc not extracted from zinc oxide through reduction using CO?
Advertisements
Solution
The Zn, ZnO curve is below the CO, CO2 curve in the Ellingham diagram. This suggests that ΔG° is less negative for the creation of CO2 from CO than it is for the formation of ZnO from Zn. Therefore, a very high temperature may be needed for the reduction process if CO is utilised as a reducing agent. For this reason, reduction with CO is not used to extract zinc from ZnO.
APPEARS IN
RELATED QUESTIONS
What are Ellingham's diagrams? Write 2 features of it.
The value of ΔtGθ for formation of Cr2O3 is −540 kJ mol−1 and that of Al2O3 is −827 kJ mol−1. Is the reduction of Cr2O3 possible with Al?
Predict conditions under which Al might be expected to reduce MgO.
Write features of Ellingham's diagrams
Silica is a/an _______.
Given below are two statements.
Statements I: The choice of reducing agents for metal extraction can be made by using Ellingham diagram, a plot of ΔG vs temperature.
Statements II: The value of ΔS increases from left to right in Ellingham diagram. In the light of above statements, choose the most appropriate from the options given below:
With respect to an ore, Ellingham diagram helps to predict the feasibility of its.
In blast furnace, the hearth is lined with ______.
The o, p-directing but deactivating group is ______.
Assertion A: Magnesium can reduce Al2O3 at a temperature below 1350°C, while above 1350°C aluminium can reduce MgO.
Reason R: The melting and boiling points of magnesium are lower than those of aluminium.
In light of the above statements. choose most appropriate answer from the options given below:
An Ellingham diagram provides information about ______.
