Home
Class 12
CHEMISTRY
Enthalpy of an exothermic reaction is al...

Enthalpy of an exothermic reaction is always

A

positive

B

negative

C

zero

D

may be positive or negative.

Text Solution

Verified by Experts

The correct Answer is:
B
For exothermic reactions ,
`sumH_(("Products")) lt sumH_(("Reactants"))`
Thus, `DeltaH` which is `(sumH_("Products") - sumH_("Reactants"))` is negative.
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL KINETICS

    DINESH PUBLICATION|Exercise Additional Numerical Problems For Practice|16 Videos

  • CHEMISTRY IN EVERY DAY LIFE

    DINESH PUBLICATION|Exercise Unit test-9|50 Videos

Similar Questions

Explore conceptually related problems

In exothermic reaction

For an exothermic reaction

Comment on the following statements: (a) An exothermic reaction is always thermodynamically spontaneous. (b) Reaction with DeltaG^(@) lt 0 always have an equilibrium constant greater than 1.

Comment on the following statements: (a) An exothermic reaction is always thermodynamically spontaneous. Reaction with DeltaG lt O always have an equilibrium constant greater than 1

DINESH PUBLICATION-CHEMICAL THERMODYNAMICS AND CHEMICAL ENERGETICS -Exercise
  1. The reaction is sontaneous if the cell potential is

    Text Solution

    |

  2. In an endothermic reaction, the value of DeltaH is

    Text Solution

    |

  3. Enthalpy of an exothermic reaction is always

    Text Solution

    |

  4. DeltaH for solid to liquid transitions for protein A and B are 2.73 kc...

    Text Solution

    |

  5. The heat absored at constant volume is equal to the system's change in

    Text Solution

    |

  6. Which of the following holds good to the laws of thermodynamics for th...

    Text Solution

    |

  7. For a melting of a solid at 25^(@)C, the fusion process requires energ...

    Text Solution

    |

  8. The difference between Delta H and Delta U for the combustion of metha...

    Text Solution

    |

  9. The heat of neutralisation is maximum when

    Text Solution

    |

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

    Text Solution

    |

  11. The law of thermodynamics that provides the basis for the determinatio...

    Text Solution

    |

  12. The heat of combustion of graphite and carbon monoxide respectively ar...

    Text Solution

    |

  13. In order to decompose 9 grams of water 142.5 KJ heat is required. Henc...

    Text Solution

    |

  14. In an adiabatic expansion of an ideal gas -

    Text Solution

    |

  15. The free energy change for a reversible reaction at equilibrium is

    Text Solution

    |

  16. Which of the following conditions regarding the chemical process ensur...

    Text Solution

    |

  17. If for a given substance, melting point is T(B) and freezing point is ...

    Text Solution

    |

  18. When 1 mole of gas is heated at constant volume. Temperature is raised...

    Text Solution

    |

  19. Enthalpy of CH(4)+(1)/(2)O(2)rarrCH(3)OH is negative. If enthalpy of...

    Text Solution

    |

  20. The heat required to raise the temperature of a body by 1 K is called

    Text Solution

    |