WAEC Chemistry 2021 Objective — Question 49

Question 49 of 50 from the West African Examinations Council (WAEC) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

49. A coordinate covalent bond could be formed between

A. NH3 and PCl3.Correct
B. BCl3 and AlCl3.
C. BCl3 and NH3.
D. H+ and AlCl3.

Explanation

A coordinate (dative) covalent bond forms when one species donates both bonding electrons; per the given answer key, this pairing is identified as NH3 and PCl3.

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