Home
Class 12
CHEMISTRY
The enthalpies of elements in their stan...

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound

A

is always negative

B

is always positive

C

may be positive or negative

D

is never negative

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level-III)|10 Videos

  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Recent Examination Question|15 Videos

  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Recent Examination Question|15 Videos

  • THE SOLID STATE

    MODERN PUBLICATION|Exercise RECENT EXAMINATION QUESTIONS|11 Videos

  • UNIT TEST - 3

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS|59 Videos

Similar Questions

Explore conceptually related problems

Define standard enthalpy of formation .

Define heat (Enthalpy) of formation.

Define enthalpy of combustion.

Standard molar enthalpy of formation of CO_(2) is equal to

Define heat (enthalpy) of transition.

Explain standard enthalpy of reaction.

Define heat of enthalpy of a solution.

Define Molar enthalpy of fusion.

MODERN PUBLICATION-THERMODYNAMICS-Multiple Choice Questions (Level-II)
  1. Delta(f)U^(@) of formation of CH(4)(g) at certain temperature is - 393...

    Text Solution

    |

  2. In an adiabatic process, no transfer of heat takes place between syste...

    Text Solution

    |

  3. The enthalpies of elements in their standard states are taken as zero....

    Text Solution

    |

  4. Enthalpy of sublimation of a substance is equal to

    Text Solution

    |

  5. Which of the following is not correct ?

    Text Solution

    |

  6. On the basis of thermochemical equation (a), (b) and (c ), which of th...

    Text Solution

    |

  7. The standard free energy changes (Delta G^(@)) is related to equilibri...

    Text Solution

    |

  8. If Delta(f)G^(@) for NH(3)(g) is - 16.4 kJ mol^(-1), then Delta G^(@) ...

    Text Solution

    |

  9. A cylinder of gas supplied by Bharat Petroleum is assumed to contain 1...

    Text Solution

    |

  10. Given : C(2)H(6)(g) rarr 2C(g) + 6H(g) : Delta H = 712 kcal The C ...

    Text Solution

    |

  11. Four grams of graphite is burnt in a bomb calorimeter of heat capacity...

    Text Solution

    |

  12. A chemical reaction is spontaneous at 298 K but non-spontaneous at 350...

    Text Solution

    |

  13. The bond energies of of C - C, C = C, H - H and C - H linkages are 350...

    Text Solution

    |

  14. Two moles of an ideal gas is expanded isothermally and reversible from...

    Text Solution

    |

  15. To neutrealize completely 20 mL of 0.1 M aqueous solution of phosphoru...

    Text Solution

    |

  16. The rusting of iron takes place as follows : 2H^(+) + 2e^(-) + (1)/(...

    Text Solution

    |

  17. For a spontaneous reaction, Delta G, equilibrium constant (K) and E(ce...

    Text Solution

    |

  18. Consider an endothermic reaction : XrarrY with activation energie...

    Text Solution

    |

  19. Consider the reaction, N(2) + 3H(2) rarr 2NH(3) carried out ata consta...

    Text Solution

    |

  20. If the bond dissociation energy of XY, x (2) AND y(2) (all diatomic m...

    Text Solution

    |