Home
Class 12
CHEMISTRY
Two isotopes P and Q atomic weight 10 an...

Two isotopes `P` and `Q` atomic weight `10` and `20`, respectively are mixed in equal amount by weight. After `20` days their weight ratio is found to be `1:4`. Isotope `P` has a half-life of `10` days. The half-life of isotope `Q` is

A

Zero

B

5 day

C

20 day

D

Infinite

Text Solution

Verified by Experts

The correct Answer is:
c
p=w q=w
No. of `p=w/4` `q=4xxw/4`,`2""^(n)=w/w=2`
`n=1,t=t""_(1//2)=20`
Promotional Banner

Topper's Solved these Questions

  • NUCLEAR CHEMISTRY

    NARAYNA|Exercise MULTI ANSWER|15 Videos

  • NUCLEAR CHEMISTRY

    NARAYNA|Exercise MATRIX MATCH|9 Videos

  • NUCLEAR CHEMISTRY

    NARAYNA|Exercise STATEMENT|4 Videos

  • METTALURGY

    NARAYNA|Exercise Statement Typer Question|2 Videos

  • ORGANIC COMPOUNDS CONTAINING NITROGEN

    NARAYNA|Exercise EXERCISE-4|30 Videos

Similar Questions

Explore conceptually related problems

If 2g of an isotope has a half - life of 7 days, the half life of 1g sample is

The radioactive isotopes A and B of atomic mass X and Y are mixed in equal amount by mass after 20 days, their mass ratio is formed to be 1 : 3. Half life of 'A' is 1 day. What will be the half life of B?

If 8.0 g of radioactive isotope has a half life of 10 hours, the half life of 2.0 g of the same substance is

After a period of 100 days the radioactive of an isotope remains 1/4th of the original activity . The half life of the isotope is

NARAYNA-NUCLEAR CHEMISTRY-SINGLE ANSWER
  1. In a first order reaction, the concentration of the reactants is reduc...

    Text Solution

    |

  2. The decay constant of a radioactive sample is 'lambda'. The half-life ...

    Text Solution

    |

  3. An element X decays first by positron emission and then two alpha-part...

    Text Solution

    |

  4. In the reaction represented by, ""(Z)""^(A)Xto.""(Z-2)""^(A-4)Yto.""...

    Text Solution

    |

  5. The number of beta-particles emitted during the change ""(a)""^(c)Xto"...

    Text Solution

    |

  6. The decay constant of a radioactive substance is 0.173 (year)""^(-1). ...

    Text Solution

    |

  7. The radioactivity of a sample is R(1) at a time T(1) and R(2) at time ...

    Text Solution

    |

  8. If the amount of radioactive substance is increased three times, the n...

    Text Solution

    |

  9. The intergrated rate equation is Rt = log, C(0) - log C(t). The stra...

    Text Solution

    |

  10. The number of neutrons accompanying the formation of ""(54)""^(139)Xe ...

    Text Solution

    |

  11. The numberr of neutrons emitted when ""(92)""^(235)U undergoes control...

    Text Solution

    |

  12. Two radioactive elements X and Y half-live pf 50 and 100 minute respe...

    Text Solution

    |

  13. The time in which activity of an element is reduced to 90% of its orig...

    Text Solution

    |

  14. The half of ""(92)""^(238)U against alpha-decay is 4.5xx10""^(9)year. ...

    Text Solution

    |

  15. Two isotopes P and Q atomic weight 10 and 20, respectively are mixed i...

    Text Solution

    |

  16. A rock is found to contain U-238 and Pb-206 in the ratio of 3 : 2. If ...

    Text Solution

    |

  17. Half life of a radioactive substance is 60 min. After 3 hours, the fra...

    Text Solution

    |

  18. The activity of a sample of radioactive material A(1) at time t(1) and...

    Text Solution

    |

  19. An old chair of wood show ""(6)C""^(14) activity which is 80% of the a...

    Text Solution

    |

  20. For nuclide ""(Z)X""^(A), which of the following changes snot take pla...

    Text Solution

    |