Question 4 - Chemistry CBSE Class 12 Sample Paper for 2023 Boards - Solutions - Solutions to CBSE Sample Paper - Chemistry Class 12

Last updated at April 16, 2024 by Teachoo

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.)

¹⁵ O
¹⁹ O
Both will have the same half-life
None of the above, information given is insufficient

Answer:

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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