Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

what do you mean by ellingams diagram ? explain its importance 
Asked by niharikapabba2605 | 07 Aug, 2018, 11:23: AM
answered-by-expert Expert Answer
  • Ellingham Diagram:

 

  • The graphical representation of Gibbs energy was first used by H.J.T.Ellingham.
  • This representation provides a basis for considering the choice of reducing agent in the reduction of oxides. This is known as Ellingham Diagram.
  • Such diagrams help us in predicting the feasibility of thermal reduction of an ore.
  • Ellingham diagram normally consists of plots of ΔfGo vs T for the formation of oxides of elements. These diagrams can also be constructed for sulphides and halides of elements.
  • Consider the reaction involving the formation of metal oxide.
               2XM(s) + O2 → 2MxO(s)
  • In this reaction, oxygen gas is consumed and metal oxide is formed.
  • Since gases have higher entropy than liquids and solids; hence ΔS becomes negative. Thus, if the temperature is increased, TΔS becomes more negative. Also, the ΔG becomes less negative.
  • This means that ΔfGo against T lines have a positive slope for the reactions of the above type.
  • Each line is straight line except some change in phase takes place. The temperature, at which such change occurs, is indicated by an increase in slope on the positive side.
  • For example, in the Zn-ZnO plot, at the boiling point of zinc, there is an abrupt increase in the positive slope of the curve. 
Answered by Varsha | 07 Aug, 2018, 12:44: PM
CBSE 12-science - Chemistry
Asked by yashrajgharte24.12dgatl | 14 Oct, 2021, 10:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Chemistry
Asked by bindersaran3 | 04 Jun, 2020, 09:18: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Chemistry
Asked by tribikramdash16 | 16 May, 2020, 06:51: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Chemistry
Asked by jain.pradeep | 28 Feb, 2020, 11:39: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Chemistry
Asked by jain.pradeep | 27 Feb, 2020, 02:49: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Chemistry
Asked by jain.pradeep | 27 Feb, 2020, 02:49: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Chemistry
Asked by jain.pradeep | 26 Feb, 2020, 09:58: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Chemistry
Asked by sree1791983 | 23 Feb, 2020, 08:38: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Chemistry
Asked by taruarora2605 | 26 Jan, 2020, 11:58: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Chemistry
Asked by Vidushi412 | 02 Mar, 2019, 02:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×