Home
Class 12
CHEMISTRY
For the first order reaction the half li...

For the first order reaction the half life period is (if k is rate constant and a is initial concentration ) :

A

`(log 2)/(k)`

B

`(1)/(ka)`

C

`(ln k)/(a)`

D

`(log k)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • UNIT TEST 4

    MODERN PUBLICATION|Exercise QUESTIONS|60 Videos

  • UNIT TEST 6

    MODERN PUBLICATION|Exercise Questions|60 Videos

Similar Questions

Explore conceptually related problems

For first order reaction, rate constant :

In a first order reaction ArarrB if k is rate constant and initial concentration of the reactant A is 0.5 M then the half - life is :

For an nth order reaction the half life period t_(1//2) is proportional to (initial conc = C_(0)) :

Derive the relationship between half-life period and rate constant for a first order reaction.

b) Show that the half - life period of a first order reaction is independent of initial concentration of reacting species.

A certain first order reaction is half completed in 46 min. Calculate the rate constant and also time for 75% completion of the reaction.

What happens to the half life period for a first order reaction, if the initial concentration of the reactants is increased?

MODERN PUBLICATION-UNIT TEST 5 -QUESTIONS
  1. 5 ml of 1 NHCl, 20 ml of N/2 H (2) SO (4) and 30 ml of N /3 HNO (3) ar...

    Text Solution

    |

  2. Given E ^(@)(Cr ^(3+)|Cr)=-0.72V and E ^(@)(Fe ^(2+)|Fe)=-0.42 V. The ...

    Text Solution

    |

  3. A solution oof nickel sulphate in which nickel rod is dipped is dilute...

    Text Solution

    |

  4. The equivalent conductance of M/32 solution of a work monobasic acid i...

    Text Solution

    |

  5. When ln k is poltted against 1/T, the slope was found to be - 10.7 xx ...

    Text Solution

    |

  6. For the first order reaction the half life period is (if k is rate con...

    Text Solution

    |

  7. For the first order reaction, time required for 99% completion is :

    Text Solution

    |

  8. In the reversible reaction 2NO (2) hArr N(2)O(4), the rate of disappea...

    Text Solution

    |

  9. A metal crystallized in fcc lattcie and edge of the unit cell is 620 p...

    Text Solution

    |

  10. A posible mechanism for the reaction : 2NO + 2H(2) to N (2) + 2H(2) ...

    Text Solution

    |

  11. A radioactive isotope has half life of 27 days. Starting with 4g of th...

    Text Solution

    |

  12. The appearance of colour in solid alkali halides is generally due to

    Text Solution

    |

  13. The half life period of an radioactive element is 1.4 xx 10 ^(10) year...

    Text Solution

    |

  14. CsBr crystallzes in a body centred cubgic lattice . The unit cell leng...

    Text Solution

    |

  15. At low pressure and at high pressure, Freundlich adsorption isotherm m...

    Text Solution

    |

  16. Which of the following statements is not correct regarding physical an...

    Text Solution

    |

  17. If k for a first order reaction is 5.48 xx 10 ^(-14) s ^(-1), its two ...

    Text Solution

    |

  18. A 0.5 molal solution of ethylene glycol in water is used as coolant in...

    Text Solution

    |

  19. Which of the following is correct graph for a second order reaction ?

    Text Solution

    |

  20. A first order reactin is 15% complete in 20 minutes. Its rate constant...

    Text Solution

    |