Home
Class 12
CHEMISTRY
Spontaneous adsorption of a gas on solid...

Spontaneous adsorption of a gas on solid surface is an exothermic process because

A

`DeltaH` increase for system

B

`DeltaS` increases for gas

C

`DeltaH` decreases for gas

D

`DeltaG` increases for gas

Text Solution

Verified by Experts

The correct Answer is:
C
For spontaneous adsorption process, standard Gibbs's energy free energy `(DeltaG)`, must be negative as well as the degree of randomnes of gas moleucle on the surface of solid decreases. For exothermic process, `DeltaH` must be negative. Hence, with the help of following equation.
`DeltaH = DeltaG + T.DeltaS`
`T.DeltaS` is negative. Thus, during adsorption `DeltaS` decreases
As, we know that `DeltaG = DeltaH - TDeltaS`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    VMC MODULES ENGLISH|Exercise LEVEL-2|50 Videos

  • THERMODYNAMICS

    VMC MODULES ENGLISH|Exercise LEVEL-2 (NUMERICAL VALUE TYPE)|15 Videos

  • THERMODYNAMICS

    VMC MODULES ENGLISH|Exercise LEVEL-0 (LONG ANSWER TYPE (5 MARKS))|6 Videos

  • THERMOCHEMISTRY

    VMC MODULES ENGLISH|Exercise JEE ADVANCED (ARCHIVE)|31 Videos

  • THERMODYNAMICS & THERMOCHEMISTRY

    VMC MODULES ENGLISH|Exercise Impeccable|48 Videos

Similar Questions

Explore conceptually related problems

Sponetaneous adsorption of a gas on solid surface is an exothermic process because

Spontaneous adsorption of a gas on a solid surface is exothermic process because

Adsorpton of gases on solid surface is generally exothermic because :

Adsorpton of gases on solid surface is generally exothermic because :

The adsorption of vapours on a clean surface is a spontaneous process because

Explain the terms: Physisorption and Chemisorption. How does adsorption of a gas on a solid surface vary with pressure?

Dissolution of a solute is an exothermic process if

The correct statement (S) pertaining to the adsorption of a gas on a solid surface is (are)

The correct variation for adsorption of a gases on a solid surface with pressure of the gas, in the following manner is

The physical adsorption of gases on the solid surface is due to :

VMC MODULES ENGLISH-THERMODYNAMICS-LEVEL-1
  1. Calculate the entropy change for the following reaction H(2)(g) +CI(...

    Text Solution

    |

  2. The free energy for a reaction having DeltaH=31400 cal, DeltaS=32" cal...

    Text Solution

    |

  3. Spontaneous adsorption of a gas on solid surface is an exothermic proc...

    Text Solution

    |

  4. The enthalpy change for transition of liquid water to steam is 40.8 kJ...

    Text Solution

    |

  5. Which of the following statements is true?

    Text Solution

    |

  6. In a reversible process, the value of Delta S (sys) + Delta S(surr) is

    Text Solution

    |

  7. Consider the following cyclic process. I. Isothermal , II. Adiaba...

    Text Solution

    |

  8. The following diagram represents the (p-V) changes of gas. Thus, total...

    Text Solution

    |

  9. Which of the following proces is (are) expected to be spontaneous at h...

    Text Solution

    |

  10. Which of the plots of ln K vs (1/T) is/are correct?

    Text Solution

    |

  11. The value of DeltaH("transition") of C (graphite) rarr C (diamond) is ...

    Text Solution

    |

  12. Among the following , the state funcation (s) is (are)

    Text Solution

    |

  13. For an endothermic reaction, Delta H represents the enthalpy of the re...

    Text Solution

    |

  14. Match the following:

    Text Solution

    |

  15. Match the Column:

    Text Solution

    |

  16. For the gas phase reaction, PCl(5)(g) hArr PCl(3)(g) + Cl(2)(g) Wh...

    Text Solution

    |

  17. The Haber's process of production of ammonia involves the equilibrium:...

    Text Solution

    |

  18. If a gas, at constant temperature and pressure expands, then its

    Text Solution

    |

  19. Considering the reaction, C(s) + O(2)(g) to CO(2)(g) + 393.5 kJ th...

    Text Solution

    |

  20. Considering entropy (S) as a thermodynamic parameter, the criterion fo...

    Text Solution

    |