JAMB Chemistry 2020 Objective — Question 5
Question 5 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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5. The decay series of 234/92U is abbreviated as: 234/92U -Q-> Z -R-> 214/82Pb -S-> 212/84Po. Identify both the number and types of radiation represented by the letters Q, R and S respectively.
- A. A. 2-beta and 2-neutron and 2-gamma
- B. B. 3-alpha, 2-beta, and 2-neutronCorrect
- C. C. 3-beta, 2-alpha and 3-gamma
- D. D. 2-alpha, 2-beta and 3-neutron
Explanation
Working through the mass and atomic number changes in the decay chain from U-234 to Pb-214 to Po-212 gives a combination of 3 alpha and 2 beta emissions (with mass/atomic number balancing across the steps).
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