WAEC Chemistry 2024 Objective — Question 20
Question 20 of 50 from the West African Examinations Council (WAEC) Chemistry 2024 Objective paper, with the correct answer and a full explanation.
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20. Naturally occurring Boron is made up of 19.9% ¹⁰B and 80.1% ¹¹B. The relative atomic mass of Boron is
- A. 21.0
- B. 10.8Correct
- C. 10.5
- D. 10.0
Explanation
R.A.M = (10×19.9/100) + (11×80.1/100) = 1.99 + 8.811 = 10.801 ≈ 10.8.
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