Home
Class 12
CHEMISTRY
For which of these reactions will there ...

For which of these reactions will there be `Delta S` positive?

A

`H_(2)O_((g)) rarr H_(2)O_((l))`

B

`H_(2)+I_(2) rarr 2HI`

C

`CaCO_(3(s)) rarr CaO_((s))+CO_(2(g))`

D

`N_(2(g))+3H_(2(g)) rarr 2NH_(3(g))`

Text Solution

Verified by Experts

The correct Answer is:
C
In (a) `g gt l`, in (b) np=nr, in (d) `np lt nr`, in (c ) `s rarr g`. Hence entropy increases.
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL THERMODYNAMICS AND ENERGETICS

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (Third Law of Thermodynamics)|6 Videos

  • CHEMICAL THERMODYNAMICS AND ENERGETICS

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (HIGHER LEVEL)|112 Videos

  • CHEMICAL THERMODYNAMICS AND ENERGETICS

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (Spontaneous Process, Entropy and Second Law of Thermodynamics)|16 Videos

  • CHEMICAL KINETICS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|50 Videos

  • CHEMISTRIY IN EVERYDAY LIFE

    MARVEL PUBLICATION|Exercise TEST YOUR GRAPS|24 Videos

Similar Questions

Explore conceptually related problems

For which of the following reactions, DeltaS is not positive :

In which of the following reactions DeltaS is positive?

In which reaction Delta S is positive :-

Which of the following reaction has Delta H = Delta U ?

Which of the following reactions is Delta H less than Delta E ?

Predict which of the following reactions(s) has a positive entropy change?

MARVEL PUBLICATION-CHEMICAL THERMODYNAMICS AND ENERGETICS-MULTIPLE CHOICE QUESTIONS (Gibbs Free Energy)
  1. The occurrence of a reaction is impossible if

    Text Solution

    |

  2. For a reaction to be spontaneous at all temperatures

    Text Solution

    |

  3. For which of these reactions will there be Delta S positive?

    Text Solution

    |

  4. Free enegry , G = H - TS, is state function that indicates whther a re...

    Text Solution

    |

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

    Text Solution

    |

  6. For a system in equilibrium, DeltaG=0, under conditions of constant

    Text Solution

    |

  7. Since the enthalpy of elements in their natural state is taken to be z...

    Text Solution

    |

  8. At constant T and P which of the following statement is correct for th...

    Text Solution

    |

  9. A chemical reaction will be spontaneous if it is accompanied by a decr...

    Text Solution

    |

  10. The standard Gibb's free energy change, DeltaG^(@) is related to equil...

    Text Solution

    |

  11. Mark the correct statement.

    Text Solution

    |

  12. One mole ofan ideal gas is allowed to expand freely and adiabatically ...

    Text Solution

    |

  13. According to the second law of thermodynamics, a process (reaction) is...

    Text Solution

    |

  14. Mechanical work is specially important in systems that contain

    Text Solution

    |

  15. The favourable conditions for a spontaneous reaction are

    Text Solution

    |

  16. Free enegry , G = H - TS, is state function that indicates whther a re...

    Text Solution

    |

  17. The enthalpy of vaporization of a substance is 840 J per mol and its b...

    Text Solution

    |

  18. If the enthalpy of vaporisation of water is 186.5 J mol^(-1), then ent...

    Text Solution

    |

  19. If 900J//g of heat is exchanged at boiling point of water then water...

    Text Solution

    |

  20. Two moles of ideal gas at 27^(@)C temperature is expanded reversibly f...

    Text Solution

    |