Home
Class 12
CHEMISTRY
The half life of a radioisotope is 4 hr....

The half life of a radioisotope is 4 hr. If the initial mass of the isotope was 200 g, the mass remaining after 24 hr undecayed is:

A

3.125 g

B

2.084 g

C

1.042 g

D

4.167 g

Text Solution

Verified by Experts

The correct Answer is:
A
No. of half life periods =6
Mass left `=([A]_(0))/(2^(6))=(200)/(2^(6))`
`=(200)/(64)=3.125g`
Promotional Banner

Topper's Solved these Questions

  • MOCK TEST PAPER 5

    MODERN PUBLICATION|Exercise QUESTION|57 Videos

  • ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES

    MODERN PUBLICATION|Exercise Recent Examination Questions|8 Videos

Similar Questions

Explore conceptually related problems

The half life of a radioactive isotope is three hours. If the initial mass of the isotope was 300 g, the mass which remained undecayed in 18 hours would be :

The half life of a radioactive element is 5 min. The fraction of the sample of this isotope that will remain after 30 min is

A radioactive isotope has half life of 27 days. Starting with 4g of the isotope, what will be the mass remaining after 75 days ?

The radio isotope, tritium (""_(1)^(3)H) has a half life period of 12-3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49-2 years?

The half - life of tritium is 12.5 years. What mass of tritium of initial mass 64 mg will remain undecayed after 50 years ?

The half-life of a radioactive nucleide 'X is 24 hours, the time required for 12.5% of the original X to remain is :

The half life period of a first order reaction is 10 mins, what percentage of the reactant will remain after one hour?

The half life period of a radioactive substance is 15 minutes. What per cent of radioactivity of that material will remain after 45 minutes ?

MODERN PUBLICATION-NUCLEAR CHEMISTRY-Multiple Choice Questions
  1. ""(92)^(235)U nucleus absorbs a neutron and disintegrates into ""(54)X...

    Text Solution

    |

  2. The radio isotope, tritium (""(1)^(3)H) has a half life period of 12-3...

    Text Solution

    |

  3. The radioactive isotope ""(27)^(60)Co which is used in the teratment o...

    Text Solution

    |

  4. A nucleide of an alkaline earth metal undergoes radioactive decay by e...

    Text Solution

    |

  5. If it is assumed that ""(92)^(235)U decays only by emitting alpha-and ...

    Text Solution

    |

  6. The beta- decay of a radioactive element results in formation of its :

    Text Solution

    |

  7. In the radioactive decay: ""(Y)X^(Z)overset(-(8alpha and 6beta))to""...

    Text Solution

    |

  8. Which of the following has highest value of radioactivity ?

    Text Solution

    |

  9. The relative penetrating power of alpha,beta,gamma and neutron (n) fol...

    Text Solution

    |

  10. A beta-particle is emitted by a radioactive nucleus at the time of con...

    Text Solution

    |

  11. ""(11)^(23)Na is more stable isotope of Na. Find out the process by w...

    Text Solution

    |

  12. The radioactive nucleide ""(90)^(134)Th undergoes two successive beta-...

    Text Solution

    |

  13. Consider the following nuclear reaction : ""(92)^(238)Mto""(y)^(x)N+...

    Text Solution

    |

  14. The half life of a radioisotope is 4 hr. If the initial mass of the is...

    Text Solution

    |

  15. A photon of hard gamma radiation knocks a. proton out of ""(12)^(24)Mg...

    Text Solution

    |

  16. In the transformation of ""(92)^(238)U to ""(92)^(234)U, if one emissi...

    Text Solution

    |

  17. A positron is emitted from ""^(23)Na. The ratio of atomic mass and ato...

    Text Solution

    |

  18. Which of the following nuclear reactions will generate an isotope ?

    Text Solution

    |

  19. A radioactive element gets spilled over the floor of a room. Its half-...

    Text Solution

    |

  20. Bombardment of aluminium by alpha-particles lead to its artificial dis...

    Text Solution

    |