Home
Class 11
CHEMISTRY
In an exothermic reaction heat is evolve...

In an exothermic reaction heat is evolved and system loses heat to the surrounding. For such system

A

`q_(p)` will be negative

B

`Delta_(r) H` will be negative

C

`q_(p)` will be positive

D

`Delta_(r) H` will be positive

Text Solution

Verified by Experts

The correct Answer is:
A, B
Exothermic reactions are those reactions which are accompanied by the evolution of heat. e.g. `C(s) + O_(2) (g) rarr CO_(2) (g) + 393.5 kJ`
`H_(2) (g) + (1)/(2) O_(2) (g) rarr H_(2) O (l) + 285.8 kJ`
`q_(p) " and " Delta_(r)H` are negative for exothermic reaction.
Promotional Banner

Topper's Solved these Questions

  • THE S-BLOCK ELEMENTS

    NCERT EXEMPLAR|Exercise Long Answer Type Questions|8 Videos

Similar Questions

Explore conceptually related problems

In isothermal process if heat is evolved from the system then

When no heat is absorbed by the system them from the surroundings, but work (w) is done on the system, the change in internal energy of the system is given as

When does a system lose energy to its surrounding and its internal energy decreases?

A process in which the system does not exchange heat with the surroundings is known as

When heat is released during the reaction, it is denoted as _______ and when work is done on system by the surroundings, it is denoted as _______ .

Express the change in internal energy of a system when (i) No heat is absorbed by the system from the surroundings, but work (w) is done on the system. What type of wall does the system have ? ii) No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. What type of wall does the system have? (iii) w amount of work is done by the system and q amount of heat is supplied to the system. What type of system would it be?

NCERT EXEMPLAR-THERMODYNAMICS-Multiple choice questions
  1. Which of the following is not correct ?

    Text Solution

    |

  2. Thermodynamics mainly deals with:

    Text Solution

    |

  3. In an exothermic reaction heat is evolved and system loses heat to the...

    Text Solution

    |

  4. The spontaneity means having the potential to proceed without assistan...

    Text Solution

    |

  5. For an ideal gas, the work of reversible expansion under isothermal co...

    Text Solution

    |

  6. Consider the following reaction between zinc and oxygen and choose t...

    Text Solution

    |

  7. 18.0 g of water completely vaporises at 100^(@)C and 1 bar pressure an...

    Text Solution

    |

  8. One mole of acetone requires less heat to vaporise than 1 mole of wate...

    Text Solution

    |

  9. Standard molar enthalpy of formation, Delta(f) H^(Θ) is just a special...

    Text Solution

    |

  10. The value of Delta(f) H^(Θ) for NH(3) is -91.8 kJ mol^(-1). Calculate ...

    Text Solution

    |

  11. Enthalpy is an extensive property. In general, if enthalpy of an overa...

    Text Solution

    |

  12. The enthaply of atomisation for the reaction : CH(4)(g) to C(g) + 4 H(...

    Text Solution

    |

  13. Use the following data to calculate Delta("lattice") H^(@) for NaBr. ...

    Text Solution

    |

  14. Given that DeltaH = 0 for mixing of two gases.Explain whether the diff...

    Text Solution

    |

  15. Heat has randomising influence on a system and temperature is the meas...

    Text Solution

    |

  16. Increase in enthalpy of the surroundings is equal to decrease in entha...

    Text Solution

    |

  17. At 298 K, K(p) for the reaction : N(2)O(4)(g) iff 2NO(2)(g) is 0.98. P...

    Text Solution

    |

  18. (a) A sample of 1.0 mol of a monoatomic ideal gas is taken through a ...

    Text Solution

    |

  19. The standard molar entropy of H(2)O(l) is 70 J K^(-1) "mol"^(-1).Wil...

    Text Solution

    |

  20. Identify the state functions and path functions out of the following: ...

    Text Solution

    |