Home
Class 12
CHEMISTRY
The enthalpy change for a given reaction...

The enthalpy change for a given reaction at `298 K` is `-x cal mol^(-1)`. If the reaction occurs spontaneously at `298 K`, the entropy change at that temperature

A

Can be negative but numerically larger than `x//298 cal K^(-1)mol^(-1)`

B

Can be negative but numerically smaller than `x//298 cal K^(-1)mol^(-1)`

C

Cannot be negative

D

Cannot be positive

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    ALLEN|Exercise EXERCISE -3|108 Videos

  • THERMODYNAMICS

    ALLEN|Exercise EXERCISE -4|18 Videos

  • THERMODYNAMICS

    ALLEN|Exercise EXERCISE -1B|22 Videos

  • TEST PAPERS

    ALLEN|Exercise CHEMISTRY|19 Videos

  • Thermodynamics And Thermo Chemistry

    ALLEN|Exercise All Questions|39 Videos

Similar Questions

Explore conceptually related problems

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

Preidict which of the following reactions would not procees spontaneously at 298 K

Predict which of the following reactions would proceed spontaneously at 298K?

The entropy chnge for a non-spontaneous reaction is 140 J/K.mole at 298 K. The reaction is_____________.

Gibbs-Helmoholtz equation relates the free energy change to the enthalpy and entropy changes of the process as (DeltaG)_(PT) = DeltaH - T DeltaS The magnitude of DeltaH does not change much with the change in temperature but the enrgy factor T DeltaS changes appreciably. Thus, spontaneity of a process depends very much on temperature. The enthalpy change for a certain reaction at 300K is -15.0 kcal mol^(-1) . The entropy change under these conditions is -7.2 cal K^(-) mol^(-1) . The free enegry change for the reaction and its spontaneous//nonspontaneous character will be

The oxidation of iron occurs as: 4Fe(s) + 3 O_(2)(g) to 2Fe_(2)O_(3)(s) The enthalpy of formation of Fe_(2)O_(3) is - 824.2 kJ mol^(-1) and entropy change for the reaction is -549 J K^(-1) mol^(-1) at 298 K. Inspite of negative entropy change of this reaction, why is the reaction spontaneous at 298 K?

ALLEN-THERMODYNAMICS -EXERCISE -2
  1. If Delta H gt 0 and Delta S gt 0, the reaction proceeds spontaneously ...

    Text Solution

    |

  2. The temperature at which the reaction : Ag(2)O(s)rarr 2Ag(s)+1//2O(2)(...

    Text Solution

    |

  3. The enthalpy change for a given reaction at 298 K is -x cal mol^(-1). ...

    Text Solution

    |

  4. Which of the following is true fo the reacion H(2)O(l)hArr H(2)O(g) at...

    Text Solution

    |

  5. For the reaction Ag(2)O(s)rarr 2Ag(s)+1//2O(2)(g) the value of Delta H...

    Text Solution

    |

  6. For hypothetical reversible reaction 1//2A(2)(g) +3//2B(2)(g) rarr A...

    Text Solution

    |

  7. For the precipitation of AgCl by Ag^(+) ions and HCl

    Text Solution

    |

  8. What is the sign of Delta G for the process of ice melting at 283 K ?

    Text Solution

    |

  9. What is the free energy change, 'DeltaG' When 1.0 mole of water at 100...

    Text Solution

    |

  10. A reaction A +B rarr C+D +q is found to have a positive entropy change...

    Text Solution

    |

  11. Equilibrium constant of a reaction is elated to :

    Text Solution

    |

  12. The Vant Hoff equation is :

    Text Solution

    |

  13. If Delta G^(@)gt 0 for a reaction then :

    Text Solution

    |

  14. The equilibrium constant for a reaction is 10. What will be the value ...

    Text Solution

    |

  15. When the value of entropy is greater then the ability for useful work ...

    Text Solution

    |

  16. The process of evaporation of a liquid is accompanied by

    Text Solution

    |

  17. For the process CO(2(s)) rarr CO(2(g))

    Text Solution

    |

  18. Which of the following provide exceptions to third law of thermodynami...

    Text Solution

    |

  19. The Gibbs free energy change of a reaction at 27^(@)C is -26 Kcal. and...

    Text Solution

    |

  20. Which of the following reaction is expected never to be spontaneous :-

    Text Solution

    |