Home
Class 12
CHEMISTRY
In the presence of a catalyst, the heat ...

In the presence of a catalyst, the heat evolved or absorbed during the reaction__________

A

decreases

B

increases

C

remains unaffected

D

may increase or decrease

Text Solution

Verified by Experts

The correct Answer is:
C
Catalyst changes activation energy or it stabilise intermediates but not the reactant or product, so enthalpy of reaction remains unaffected.
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL KINETICS

    VMC MODULES ENGLISH|Exercise Level-2|50 Videos

  • CHEMICAL KINETICS

    VMC MODULES ENGLISH|Exercise Level-2 ( Numerical Value Type for JEE Main )|15 Videos

  • CHEMICAL KINETICS

    VMC MODULES ENGLISH|Exercise Level-0 (Long Answer Type )|6 Videos

  • CHEMICAL EQUILIBRIUM

    VMC MODULES ENGLISH|Exercise IN-CHAPTER EXERCISE - G|10 Videos

  • CHEMICAL THERMODYNAMICS

    VMC MODULES ENGLISH|Exercise IN - CHAPTER EXERCISE - L|10 Videos

Similar Questions

Explore conceptually related problems

Why is heat evolved or absorbed in a chemical reaction ?

How do temperature and the presence of a catalyst bring about an increase in the rate of a reaction ?

Refer picture given below. (a) Calculate DeltaH for the reaction and the energy of activation for the forward reaction as well as backward reaction. (b) The dotted curve is in the presence of a catalyst. What is the energy of activation for the two reactions in the presence of catalyst? ( c) Will the catalyst change the extent of reaction?

Assertion: A catalyst increases the rate of a reaction. Reason: In presence of a catalyst, the activation energy of the reaction decreases.

In the presence of a catalyst, the rate of a reaction grows to the extent of 10^(5) times at 298 K . Hence, the catalyst must have lowered E_(a) by

Monera evolved during

Aromatic aldehydes in the presence of cyanide ion as catalyst, are converted to acyloins. This reaction is called

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst. Reason (R) A catalyst participating in the reaction froms different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains the same.

When o-hydroxybenzaldehyde is heated with ethanoic anhydride in the presence of sodium ethanoate, compound formed during the reaction is?

In presence of a catalyst, what happens to the chemical equilibrium?

VMC MODULES ENGLISH-CHEMICAL KINETICS -Level-1
  1. Which of the following explains the fact that the reactions of high mo...

    Text Solution

    |

  2. On increasing the temperature by 10K, the rate of reaction becomes dou...

    Text Solution

    |

  3. In the presence of a catalyst, the heat evolved or absorbed during the...

    Text Solution

    |

  4. If K(1)= Rate constant at temperature T(1) and k(2) rate constant at t...

    Text Solution

    |

  5. A catalyst :

    Text Solution

    |

  6. Diazonium salt decomposes as C(6)H(5)N(2)^(o+)Cl^(ɵ) rarrC(6)H(5)Cl...

    Text Solution

    |

  7. Which of the following statement is not correct about order of a ...

    Text Solution

    |

  8. For a given reaction of first order, it takes 20 minutes for the conce...

    Text Solution

    |

  9. 7/8th of the active nuclei present in a radioactive sample has decayed...

    Text Solution

    |

  10. When ethyl acetate was hydrolyzed in the presence of 0.1 M HCl, the co...

    Text Solution

    |

  11. The amount of radioactive ""(52)I^(123) (t(1//2)=25 minutes) left afte...

    Text Solution

    |

  12. The half life of a first order reaction is 10 minutes. If initial amou...

    Text Solution

    |

  13. The rate of a gaseous reaction is given by the expression k[A]^(2)[B]^...

    Text Solution

    |

  14. For an endothermic reaction, Delta H represents the enthalpy of the re...

    Text Solution

    |

  15. In a first order reaction, 75% of the reactants disappeared in 1.386 h...

    Text Solution

    |

  16. For the reaction , N2O4(g)underset(K2)overset(K1)hArr2NO2(g), the rat...

    Text Solution

    |

  17. The rate constant, activation energy, and Arrphenius parameter of a ch...

    Text Solution

    |

  18. For a first order reaction with rate constant 'k' and initial concentr...

    Text Solution

    |

  19. The rate constant is given by the equation k = P.Ze^(-E(a)//RT). Which...

    Text Solution

    |

  20. The temperature coefficient for most of the reaction lies between

    Text Solution

    |