Home
Class 11
CHEMISTRY
The half life of a first order reaction ...

The half life of a first order reaction is 60 sec . The percentage of reactant left after 3 minutes is

A

7.5

B

15

C

25

D

12.5

Text Solution

Verified by Experts

The correct Answer is:
D
The concentration after n half lives
`N=(N_(0))/(2^(n))=(N_(0))/(2^(3))=(N_(0))/(8)` (n=no. of half lives) age left `=(N_(0))/(8)xx100=12.5`
Promotional Banner

Topper's Solved these Questions

  • NUCLEAR AND RADIO CHEMISTRY

    DINESH PUBLICATION|Exercise Unit Test 4|40 Videos

  • NOMENCLATURE OF ORGANIC COMPOUNDS

    DINESH PUBLICATION|Exercise MCQs|13 Videos

  • ORGANIC CHEMISTRY - SOME BASIC PRINCIPLES & TECHNIOUES

    DINESH PUBLICATION|Exercise PURIFICATION & CHARACTERISATION OF ORGANIC COMPOUNDS|38 Videos

Similar Questions

Explore conceptually related problems

The half-life period of a first order reaction is 600 s. What percent of A remains after 30 minutes ?

The half life period of a first order reaction is 60 min. What percentage will be left after 240 min.

The half life period of a first order reaction is 60 minutes. What percentage of the reactant will be left behind after 120 minutes ?

The half-life period of a first order reaction is 60 minutes. What percentage will be left after 240 minutes ?

The half life of a first order reaction is 10 years . The time taken by 10 g of the reactant to reduce its half is ______.

The half-life period of a first order reaction is 15 minutes. The amount of substance left after one hour will be:

DINESH PUBLICATION-NUCLEAR AND RADIO CHEMISTRY-Evaluate Yourself
  1. From amogst Al^(3+), Cl^(-), K^(+), N^(3-), the correct order of radii...

    Text Solution

    |

  2. The enthaply change, DeltaH, in a simple one step reaction is gt 0, so...

    Text Solution

    |

  3. The half life of a first order reaction is 60 sec . The percentage of ...

    Text Solution

    |

  4. If the reaction , A + B to C+D , is thermodynamically feasible, the ti...

    Text Solution

    |

  5. For a hypothetical reaction, the following kinetic data suggested that...

    Text Solution

    |

  6. A reaction rate contant doubles between 300 and 310 k. By which of the...

    Text Solution

    |

  7. If t(0.5) of a first order reaction, PCl(5) to PCl(3) + Cl(2) is 10 mi...

    Text Solution

    |

  8. The d-orbital involved in sp^3d hybridisation is

    Text Solution

    |

  9. A molecules ML(5) contains 5 s bonding pairs of electrons and one non-...

    Text Solution

    |

  10. If heat of formation of HI in the given reactions (i) H(2)(g) + I(2)...

    Text Solution

    |

  11. The entropy change produced in universe when 3.6 kg of water of 47^(@)...

    Text Solution

    |

  12. A sample of radioactive element undergoes 90% decomposition in 336 min...

    Text Solution

    |

  13. The vant Hoff factor (i) for a dilute solution of potassium aluminium ...

    Text Solution

    |

  14. A 0.01 M solution of glucose in water freezes at -0.0186^(@)C A 0.01 M...

    Text Solution

    |

  15. 20 mL of HCl having a certain normality neutralises exactly 1.0 g CaCO...

    Text Solution

    |

  16. The potential of an electrode is represented as Pt. (0.25 atm)//H^(+) ...

    Text Solution

    |

  17. For the cell reaction , |Cu| Cu^(2+)(aq)|Ag^(+)|Ag is E^(@) Cu^(2)|Cu=...

    Text Solution

    |

  18. Which of the following is not possible ?

    Text Solution

    |

  19. For a reaction, SO(2) (g) + 1//2O(2)(g) to SO(3)(g) if K(p)=1.7 xx10...

    Text Solution

    |

  20. A radioactive isotope having t(1//2) =3 days was read after 12 days ....

    Text Solution

    |