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In Ellingham diagrams plots of DeltaG (o...

In Ellingham diagrams plots of `Delta`G (oxide formation) show positive slopes except for the formation of CO(g) from coke. Why?

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To answer the question regarding why the Ellingham diagram shows positive slopes for most oxide formations, except for the formation of carbon monoxide (CO) from coke, we can break down the explanation into several steps: ### Step-by-Step Solution: 1. **Understanding Ellingham Diagrams**: - Ellingham diagrams plot the Gibbs free energy change (ΔG) for the formation of oxides as a function of temperature. A positive slope indicates that the formation of the oxide becomes less favorable as temperature increases. 2. **Formation of Carbon Monoxide from Coke**: ...
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In Ellingham diagrams plots of Delta_(f)G (oxide formation) show positive slope except for the formation of CO(g) from coke. Why ?

Ellingham diagrams are plots of DeltaG_(1)^(@) Vs T for the formation of

Knowledge Check

  • In Ellingham diagram, the slope of the curve of the formation metal oxide:

    A
    is mostly `+ve`
    B
    is mostly `-ve`
    C
    depends on the type of metal
    D
    depends on the formula of metal oxide

  • Ellingham diagram is given below for the formation of some oxides. Then select the correct combination

    A
    Below
    `T_(2)Al_(2)O_(3)+ 3Mg to 3MgO+2Al, DeltaG= -ve`
    B
    Below
    `T_(3)MgO+ CO to CO_(2)+ Mg, DeltaG= -ve`
    C
    Below
    `T_(3)MgO+ CO to CO_(2)+ Mg, DeltaG= -ve`
    D
    all of the above

  • Ellingham diagram is given below for the formation of some oxides. The select the correct combination

    A
    Below `T_(2).Al_(2)O_(3)+3Mg® MgO+2Al,DG=-ve`
    B
    Below `T_(3),MgO+CO® CO_(2)+Mg,DG=-ve`
    C
    Above `T_(4),Al_(2)O_(3)+3CO® 2Al+3CO_(2) DG=-ve`
    D
    Below`T_(1)` MgO is in liquid state

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    In Ellingham diagrams of DeltaG oxide formation Vs T , which of the following graphs has negative slope ?

    Ellingham diagram is given below for the formation of some oxides. The select the correct combination

    In the Ellingham diagram , graph for the formation of CO_(2) __________.

    The choice of reducing agent for metal oxide is decided by thermodynamic principles of metallurgy. Delta G must be negative. Ellingham diagram is a plot of Delta_(f)G^(0) vs T for the formation of oxides of various elements. All the plots slope upwards when temperature increases. Each plot is a straight line except when some change in phase takes place. A metal will reduce the oxide of other metals which lie above it in this diagram. Delta G^(0) vs T plot in the Ellingham's diagram slopes downward for the reaction.

    The choice of reducing agent for metal oxide is decided by thermodynamic principles of metallurgy. Delta G must be negative. Ellingham diagram is a plot of Delta_(f)G^(0) vs T for the formation of oxides of various elements. All the plots slope upwards when temperature increases. Each plot is a straight line except when some change in phase takes place. A metal will reduce the oxide of other metals which lie above it in this diagram. At a temperature below 1623 K. Al cannot reduce

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