Home
Class 12
CHEMISTRY
In Ellingham diagrams plots of Delta(f)G...

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

A

Oxides

B

Halides

C

Sulphides

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-B) Objective type Question|25 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-C) Previous Years Question|33 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    AAKASH INSTITUTE ENGLISH|Exercise Exercise|19 Videos

  • EQUILIBRIUM

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (SECTION -D)|20 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    AAKASH INSTITUTE ENGLISH|Exercise Try Yourself|33 Videos

Similar Questions

Explore conceptually related problems

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

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

In Ellingham diagrams of Delta_(1)G oxide formation Vs T , which of the following graphs has negative slope ?

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

For a sponaneous reaction, the free energy change must be negative, Delta G=Delta H-T Delta S, Delta H is the enthalpy change during the reaction. T is the absolute temperature, and Delta S is the change in entropy during the reaction. Consider a reaction such as the formation of an oxide M+O_(2) to MO Dioxygen is used up in the course of this reaction. Gases have a more random structure (less ordered) than liquid or solids. Consequently gases have a higher entropy than liquids and solids. In this reaction S (entropy or randomness) decreases, hence Delta S is negative. Thus, if the temperature is raised then T Delta S becomes more negative,Since, TDelta S is substracted in the equation, then Delta G becomes less negative. Thus, the free energy change increases with the increase in temperature. The free energy changes that occur when one mole of common reactant (in this case dioxygen) is used may be plotted graphically aginst temperature for a number of reactions of metals to their oxides. The following plot is called an Ellingham diagram for metal oxide. Understanding of Ellingham diagram is extremely important for the efficient extraction of metals. Which of the following elements can be prepared by heating the oxide above 400^(@)C ?

The value of Delta H for the combustion of C(s) is - 94.4 Kcal. The heat of formation of CO_(2)(g) is :-

For a sponaneous reaction, the free energy change must be negative, Delta G=Delta H-T Delta S, Delta H is the enthalpy change during the reaction. T is the absolute temperature, and Delta S is the change in entropy during the reaction. Consider a reaction such as the formation of an oxide M+O_(2) to MO Dioxygen is used up in the course of this reaction. Gases have a more random structure (less ordered) than liquid or solids. Consequently gases have a higher entropy than liquids and solids. In this reaction S (entropy or randomness) decreases, hence Delta S is negative. Thus, if the temperature is raised then T Delta S becomes more negative,Since, TDelta S is substracted in the equation, then Delta G becomes less negative. Thus, the free energy change increases with the increase in temperature. The free energy changes that occur when one mole of common reactant (in this case dioxygen) is used may be plotted graphically aginst temperature for a number of reactions of metals to their oxides. The following plot is called an Ellingham diagram for metal oxide. Understanding of Ellingham diagram is extremely important for the efficient extraction of metals. As per the Ellingham diagram of oxides which of the following conclusion is true ?

For a sponaneous reaction, the free energy change must be negative, Delta G=Delta H-T Delta S, Delta H is the enthalpy change during the reaction. T is the absolute temperature, and Delta S is the change in entropy during the reaction. Consider a reaction such as the formation of an oxide M+O_(2) to MO Dioxygen is used up in the course of this reaction. Gases have a more random structure (less ordered) than liquid or solids. Consequently gases have a higher entropy than liquids and solids. In this reaction S (entropy or randomness) decreases, hence Delta S is negative. Thus, if the temperature is raised then T Delta S becomes more negative,Since, TDelta S is substracted in the equation, then Delta G becomes less negative. Thus, the free energy change increases with the increase in temperature. The free energy changes that occur when one mole of common reactant (in this case dioxygen) is used may be plotted graphically aginst temperature for a number of reactions of metals to their oxides. The following plot is called an Ellingham diagram for metal oxide. Understanding of Ellingham diagram is extremely important for the efficient extraction of metals. Free energy change of Hg and Mg for the convertion to oxides the slpe of Delta G vsT has been changed above the boiling points of the given metal because :

For a sponaneous reaction, the free energy change must be negative, Delta G=Delta H-T Delta S, Delta H is the enthalpy change during the reaction. T is the absolute temperature, and Delta S is the change in entropy during the reaction. Consider a reaction such as the formation of an oxide M+O_(2) to MO Dioxygen is used up in the course of this reaction. Gases have a more random structure (less ordered) than liquid or solids. Consequently gases have a higher entropy than liquids and solids. In this reaction S (entropy or randomness) decreases, hence Delta S is negative. Thus, if the temperature is raised then T Delta S becomes more negative,Since, TDelta S is substracted in the equation, then Delta G becomes less negative. Thus, the free energy change increases with the increase in temperature. The free energy changes that occur when one mole of common reactant (in this case dioxygen) is used may be plotted graphically aginst temperature for a number of reactions of metals to their oxides. The following plot is called an Ellingham diagram for metal oxide. Understanding of Ellingham diagram is extremely important for the efficient extraction of metals. For the conversion of Ca(s) to Ca(s) which of the following represent the Delta G vs. T ?

Which of the following reaction can be used to define the heat of formation of CO_(2)(g) ?

AAKASH INSTITUTE ENGLISH-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Assignment (Section-A) Objective type Question
  1. Which of the following is used as reducing agent in Goldschmidt method...

    Text Solution

    |

  2. Which of the following is used to reduce TiCl4 to Ti?

    Text Solution

    |

  3. In Ellingham diagrams plots of Delta(f)G (oxide formation) show positi...

    Text Solution

    |

  4. Which of the following statement is correct w.r.t. the following graph...

    Text Solution

    |

  5. In Elingham diagrams of DeltaG de formation Vs T, which of the followi...

    Text Solution

    |

  6. Which form of iron is extracted from blast furnance :

    Text Solution

    |

  7. Which of the following has lowest percentage of carbon?

    Text Solution

    |

  8. Why partial roasting of sulphide ore is done in the metallurgy of copp...

    Text Solution

    |

  9. Zinc is extracted from zinc blende by

    Text Solution

    |

  10. Which of the following metal is leached by Cyanide process

    Text Solution

    |

  11. Hall-Heroult method is used during extraction of :-

    Text Solution

    |

  12. Poling is used for the purification of:

    Text Solution

    |

  13. Impure zinc, as collected from earthen clay retort, is called

    Text Solution

    |

  14. The process of converting hydrated alumina into anhydrous alumina is c...

    Text Solution

    |

  15. Write chemical reactions taking place in the extraction of zinc from z...

    Text Solution

    |

  16. Which of the following metal is purified by distilation process?

    Text Solution

    |

  17. Vapour phase refining can be carried out in case of

    Text Solution

    |

  18. Which of the following gives metal by electrolytic reduction convenien...

    Text Solution

    |

  19. Which of the following organometallics is used in the purification of ...

    Text Solution

    |

  20. Which of the following metals is obtained by the self reduction proces...

    Text Solution

    |