Chemistry Class 12
Solutions to CBSE Sample Paper - Chemistry Class 12

Which radioactive isotope would have the longer half- life 15 O or 19 O? (Given rate constants for 15 O and 19 O are 5.63x 10 -3 s -1 and k = 2.38 x 10 -2 s -1 respectively.)

  1. 15 O
  2. 19 O
  3. Both will have the same half-life
  4. None of the above, information given is insufficient



a. 15 O

The rate constant for the decay of O-15 is less than that for O-19 . Therefore ,the rate of decay of O-15 will be slower and will have a longer half life .

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.