Home
Class 12
CHEMISTRY
The time tor half - life of a first orde...

The time tor half - life of a first order reaction is 1 h. What is the time taken for 87.5% completion of the reaction?

A

lh

B

3h

C

2h

D

4h

Text Solution

Verified by Experts

The correct Answer is:
C
`t_(1.2)=1h`
`k=0.693/t_(1/2)=0.693/1=0.693`
`therefore t_(87.5%)=2.303/k "log"_(10) (100/12.5)= 2.303/0.693 xx 0.9030=3h`
Promotional Banner

Topper's Solved these Questions

  • EAMCET-2019 (TS) SHIFT-1

    SIA PUBLICATION|Exercise CHEMISTRY|30 Videos

  • ENVIRONMENTAL CHEMISTRY

    SIA PUBLICATION|Exercise PROBLEM|16 Videos

Similar Questions

Explore conceptually related problems

The half life of a first order reaction is

The half life of a first order reaction is 100 seconds. What is the time required for 90% completion of the reaction?

The time taken for the completion of 90% of a first order reaction is 't' min . What is the time (in sec) taken for the completion of 99% of the reaction ?

Time required for 50% completion of the first order reaction in one hr. What is the time required for 99% completion of the same reaction ?

The half-life of a first order reaction is 10s. What is its rate constant (in s^(-1) ) ?

In the case of a first order reaction, the ratio of the time required for 99.9% completion of the reaction to its half life is nearly

SIA PUBLICATION-ELECTROCHEMISTRY-M.C.Q.
  1. For a reversible reaction A leftrightarrow B, which one of the followi...

    Text Solution

    |

  2. The rate constant of a first order reaction at 27^@C is 10^(-3)mi n^(-...

    Text Solution

    |

  3. Observe the following reaction: 2A + B to C The rate of formation of ...

    Text Solution

    |

  4. of a reaction cannot be determined experimentally.

    Text Solution

    |

  5. Which one of the following equations is correct for the reaction N(2)(...

    Text Solution

    |

  6. Consider the following reaction: N(2)(g) + 3H(2)(g) to 2 NH(3)(g) the ...

    Text Solution

    |

  7. One mole of A (g) is heated to 200^@ C in a one litre closed flask, ti...

    Text Solution

    |

  8. Equilibrium constant for the reaction, H(2)O (g) + CO(g) is 81. If the...

    Text Solution

    |

  9. Consider the following reaction: A to Products This reaction is comple...

    Text Solution

    |

  10. The half-life of a first order reaction is 10s. What is its rate const...

    Text Solution

    |

  11. 75% of a first order reaction is completed in 32 min. 50% of the react...

    Text Solution

    |

  12. The Delta H value for the reaction, H(2) + Cl(2) to 2HCl is - 44.12 Kc...

    Text Solution

    |

  13. In the equilibrium reaction, A +B leftrightarrow C + D The activation ...

    Text Solution

    |

  14. With respect to the figure given, which of the following statements is...

    Text Solution

    |

  15. The rate of a reaction, 2A + 3B +4C to products, is equal to R = [A]^(...

    Text Solution

    |

  16. For a reaction A + B to Products, the rate of the reaction was doubled...

    Text Solution

    |

  17. The unit of rate of first order reaction is

    Text Solution

    |

  18. The time tor half - life of a first order reaction is 1 h. What is the...

    Text Solution

    |

  19. If a reaction obeys the following equation k =2.303/t "log"(10)(a/(a-...

    Text Solution

    |

  20. The rate of reaction is generally doubled for .... rise in temperature...

    Text Solution

    |