Home
Class 12
CHEMISTRY
The spontaneous nature of a reaction is ...

The spontaneous nature of a reaction is impossible if

A

`Delta H = +ve, Delta S = + ve`

B

`Delta H = -ve, Delta S = - ve`

C

`Delta H = -ve, Delta S = + ve`

D

`Delta H = +ve, Delta S = - ve`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (Section - A) Objective Type Questions|55 Videos
  • THERMODYNAMICS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (Section - B) Objective Type Questions|35 Videos
  • THERMODYNAMICS

    AAKASH INSTITUTE ENGLISH|Exercise SECTION-J|7 Videos
  • THE SOLID STATE

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (SECTION - D) (ASSERTION-REASON TYPE QUESTION)|20 Videos

Similar Questions

Explore conceptually related problems

The occurrence of a reaction is impossible if

The force responsible for the spontaneity of a reaction is called ......

A reaction occurs spontaneously in forward direction if

A reaction will never the spontaneous at any temperature and pressure if

Free enegry , G = H - TS , is state function that indicates whther a reaction is spontaneous or non-spontaneous. If you think of TS as the part of the system's enegry that is disordered already, then (H -TS) is the part of the system's energy that is still ordered and therefore free to cause spontaneous change by becoming disordered. Also, DeltaG = DeltaH - T DeltaS From the second law of thermodynamics, a reaction is spontaneous if Delta_("total")S is positive, non-spontaneous if Delta_("total")S is negative, and at equilibrium if Delta_('total")S is zero. Since, -T DeltaS = DeltaG and since DeltaG and DeltaS have opposite sings, we can restate the thermodynamic criterion for the spontaneity of a reaction carried out a constant temperature and pressure. IF DeltaG lt 0 , the reaction is spontaneous. If DeltaG gt 0 , the reaction is non-spontaneous. If DeltaG = 0 , the reaction is at equilibrium. Read the above paragraph carefully and answer the following questions based on the above comprehension. For the spontaneity of a reaction, which statement is true?

Which of the following designation is impossible ?

A: All reactions which are exothermic are spontaneous R: All reactions in which entropy increases are spontaneous

A particular reaction at 27^(@)C for which DeltaH gt 0 and DeltaS gt 0 is found to be non-spontaneous. The reaction may proceed spontaneously if

Assertion:Electrolytic cell uses electrical energy to carry non-spontaneous chemical reactions. Reason : Chemical energy of a spontaneous redox reaction can be converted into electrical energy.

AAKASH INSTITUTE ENGLISH-THERMODYNAMICS-Exercise
  1. The enthalpy of reaction is maximum in which of the following reaction...

    Text Solution

    |

  2. On the basis of Hess's law of constant heat summation, choose the corr...

    Text Solution

    |

  3. In which of the following Delta H = Delta U ?

    Text Solution

    |

  4. Heat of combustion of CH(4),C(2)H(4),C(2)H(6) are -890,-1411 and -1560...

    Text Solution

    |

  5. The heats of neutralisation of four acidsA,B,C and D are -13.7,-9.4,-1...

    Text Solution

    |

  6. Heat of neutralisation of NaOH and HCl is -57.46 kJ // equivalent. The...

    Text Solution

    |

  7. Bond energy of N-H,H-H and N-=N are a,b,c respectively. The DeltaH for...

    Text Solution

    |

  8. At 27^(@) C, the combustion of ethane takes place according to the rea...

    Text Solution

    |

  9. For the reaction PCI (3) (g) + CI(2)(g) rightarrow PCI(5)(g), Delta ...

    Text Solution

    |

  10. Heat of which of the following reaction gives enthalpy of formation di...

    Text Solution

    |

  11. When Delta H and TDeltaS both are negative , then for spontaneous pro...

    Text Solution

    |

  12. Which of the following relation is false?

    Text Solution

    |

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

    Text Solution

    |

  14. A boiled egg shows a/an ....... In entropy

    Text Solution

    |

  15. The Delta G in the process of melting of Ice at -15^(@) C is

    Text Solution

    |

  16. The spontaneous nature of a reaction is impossible if

    Text Solution

    |

  17. Delta G^(@) of reversible reaction at its equilbrium is

    Text Solution

    |

  18. Latent heat of fusion of ice is 0.333 kJ g^(-1) . The increase in entr...

    Text Solution

    |

  19. The value for DeltaH(vap) and Delta S(vap) for ethanol are respectivel...

    Text Solution

    |

  20. 3RD LAW OF THERMODYNAMICS

    Text Solution

    |