Home
Class 11
CHEMISTRY
In a reaction P+Q rarr R+S, there is no ...

In a reaction `P+Q rarr R+S`, there is no change in entropy, Enthalpy change for the reaction `(DeltaH)` is `"12 kJ mol"^(-1)`. Under what conditions, reaction will have negative value of free energy change?

A

If `DeltaH` is positive

B

If `DeltaH` is negative.

C

If `DeltaH` is `"24 kJ mol"^(-1)`.

D

If temperature of reaction is high

Text Solution

Verified by Experts

The correct Answer is:
B

`DeltaG=DeltaH-TDeltaS, DeltaS=0 or TDeltaS=0`
`DeltaG=DeltaH`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    NCERT FINGERTIPS|Exercise Gibbs Energy Change And Equilibrium|4 Videos
  • THERMODYNAMICS

    NCERT FINGERTIPS|Exercise Higher Order Thinking Skills|8 Videos
  • THERMODYNAMICS

    NCERT FINGERTIPS|Exercise Enthalpies For Different Type Of Reaction|22 Videos
  • THE S-BLOCK ELEMENTS

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

A reaction A +B rarr C+D +q is found to have a positive entropy change, the reaction will be:

For the equilibrium reaction, the value of Gibbs free energy change is:

The entropy change for eaction at 300 K is 120 Jk^(-1) mol^(-1) . What is the enthalpy change for the reaction ?

Under what conditions is the heat of reaction equal to enthalpy change?

In the reaction A^(o+) +B rarr A +B^(o+) , there is no entropy changes. If enthalpy change is 20 kJ of A^(o+) , calculate DeltaG for the reaction.

A reaction is at equilibrium at 100^(@)C and the enthalpy change for the reaction is "42.6 kJ mol"^(-1) . What will be the value of DeltaS in "J K"^(-1)"mol"^(-1) ?

In an exothermic reaction A rarr B , the activation energy of the forward reaction is 200 kJ mol^(-1) . The enthalpy of the reaction is 280 kJ mol^(-1) . The activation energy of the reverse reaction B rarr A is

Free energy change is related to enthalpy and entropy changes as:

NCERT FINGERTIPS-THERMODYNAMICS-Spontaneity
  1. For a reaction: X rarr Y+Z Absolute entropies are X="120 J K"^(-1)"m...

    Text Solution

    |

  2. What will be the melting point of KCl if enthalpy change for the reac...

    Text Solution

    |

  3. For reversible reaction : X((g))+3Y((g))hArr 2Z((g)), DeltaH=-"40 kJ" ...

    Text Solution

    |

  4. At 373 K, steam and water are in equilibrium and DeltaH=40.98" kJ mol"...

    Text Solution

    |

  5. Match the column I with column II and mark the appropriate choice.

    Text Solution

    |

  6. Read the following statements regarding spontaneity of a process and m...

    Text Solution

    |

  7. Which of the following processes is a non-spontaneous process?

    Text Solution

    |

  8. Which of the following statements regarding Gibb's energy change is co...

    Text Solution

    |

  9. For a reaction to be spontaneous at any temperature, the conditions ar...

    Text Solution

    |

  10. For the reaction given below the value of standard Gibbs free energy o...

    Text Solution

    |

  11. What is the entropy change when 1 mole oxygen gas expands isothermally...

    Text Solution

    |

  12. Mathc the following columns and mark the appropriate choice.

    Text Solution

    |

  13. One word answer is given for the following definitions, Mark the one w...

    Text Solution

    |

  14. In a reaction P+Q rarr R+S, there is no change in entropy, Enthalpy ch...

    Text Solution

    |

  15. For reaction, 2K((g))+L((g))rarr2M((g)),DeltaU^(@)=-"10.5 KJ and "Delt...

    Text Solution

    |

  16. Which of the following statements is not correct ?

    Text Solution

    |

  17. DeltaG is the net energy available to do useful work and is a measure ...

    Text Solution

    |

  18. Dissolution of ammonium chloride in water is an endothermic reaction, ...

    Text Solution

    |

  19. What will be the signs of DeltaH and DeltaS when NaOH is dissolved in ...

    Text Solution

    |

  20. At absolute zero, the entropy of a pure crystal is zero. This is

    Text Solution

    |