Home
Class 12
CHEMISTRY
In a first order reaction, 75% of the re...

In a first order reaction, 75% of the reactants disappeared in 1.386 hours. What is the rate constant?

A

`3.6 ×x 10^(-3)s^(-1)`

B

2.7 `xx 10^(-4)s^(-1)`

C

72 `xx 10^(-3)s^(-1)`

D

1.8 `xx 10^(-3)s^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`k=(2.303)/(1.386xx60xx60)log(100)/(100-75)`
`=(2.303)/(1.386xx3600)log4=2.7xx10^(-4)s^(-1)`
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL KINETICS

    MTG GUIDE|Exercise CHECK YOUR NEET VITALS|25 Videos

  • CHEMICAL KINETICS

    MTG GUIDE|Exercise AIPMT/NEET (MCQs)|22 Videos

  • CHEMICAL KINETICS

    MTG GUIDE|Exercise AIPMT/NEET (MCQs)|22 Videos

  • BIOMOLECULES

    MTG GUIDE|Exercise AIPMT/NEET (MCQS)|19 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    MTG GUIDE|Exercise AIPMT/NEET |9 Videos

Similar Questions

Explore conceptually related problems

In a first order reaction, 75% of the reactants disappeared in 1.386 hr . What is the rate constant ?

Half life period of a first order reaction A to product is 6.93 hour . What is the value of rate constant ?

In a first order reaction, the concentration of the reactants is reduced to 25% in one hour. The half-life periof of the reactions is

For certain first order reaction, 75% of the reaction complete in 30 min. How much time it require to complete 99.9% of the reaction ?

A reaction is of second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is reduced to half ? What is the unit of rate constant of such a reaction ?

MTG GUIDE-CHEMICAL KINETICS-TOPICWISE PRACTICE QUESTIONS
  1. Half-life of a reaction is found to be inversely proportional to the c...

    Text Solution

    |

  2. The reaction A rarr B follows first order kinetics. The time taken for...

    Text Solution

    |

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

    Text Solution

    |

  4. Cyclopropane rearranges to form propene This follows first ord...

    Text Solution

    |

  5. The first order rate constant for the decomposition of N2O5 is 6.2 xx ...

    Text Solution

    |

  6. For the first order reaction, half-life is 14 s. The time required for...

    Text Solution

    |

  7. Decomposition of H2O2 was studied by titration against KMnO4 solution....

    Text Solution

    |

  8. Which of the following expressions is correct for first order reaction...

    Text Solution

    |

  9. Which of the following statements about first order is not true?

    Text Solution

    |

  10. The rate constant, k of the reaction, N2O(2(g))rarr2NO(2(g))+1/2O(...

    Text Solution

    |

  11. The first order reaction was started with a decimolar solution of the ...

    Text Solution

    |

  12. For a first order reaction ArarrB, the reaction rate at reactant conce...

    Text Solution

    |

  13. The rate of a first order reaction is 0.4 mol L^(-1)s^(-1) at 10 minut...

    Text Solution

    |

  14. The activation energies of two reactions are E1 and E2(E1> E2). If the...

    Text Solution

    |

  15. The rate constant of a reaction at 500 K and 700 K are 0.02 s^(-1) and...

    Text Solution

    |

  16. The rate constant, the activation energy and the Arrhenius parameter o...

    Text Solution

    |

  17. The rate of reaction is doubled for every 10^@C rise in temperature. T...

    Text Solution

    |

  18. Two reactions proceed at 25^@C at the same rate. The temperature coeff...

    Text Solution

    |

  19. The rate constant (k') of one of the reaction is found to be double th...

    Text Solution

    |

  20. The rate constants k, and ką for two different reactions are 10^(16).e...

    Text Solution

    |