WAEC Chemistry 2013 Objective — Question 3

Question 3 of 50 from the West African Examinations Council (WAEC) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

The formula of the compound formed between a trivalent metal, M and a divalent non-metal, Y is

A. M2Y3
B. M3Y2Correct
C. MY
D. M3Y

Explanation

Since the metal M is trivalent, its combining power is 3. Since the non-metal Y is divalent, its combining power is 2. M2Y3 ⇒ M2Y3 (i.e. M3Y2 by cross-multiplying combining powers).

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