WAEC Chemistry 2011 Objective — Question 14
Question 14 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
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When element ₂₀A combines with element ₈Y,
- A. A. a covalent compound, AY is formed
- B. B. an ionic compound, AY is formedCorrect
- C. C. an ionic compound, A2Y is formed
- D. D. a covalent compound, AY2 is formed
Explanation
20A = 2,8,8,2, so A has a combining power of 2 (loses two electrons). 8Y = 2,6, so Y also has a combining power of 2 (gains two electrons). Using the combining powers, A2+Y2- = A2Y2 = AY. Since electron transfer is involved, the compound formed is ionic.
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