WAEC Chemistry 2018 Theory — Question 22
Question 22 of 24 from the West African Examinations Council (WAEC) Chemistry 2018 Theory paper, with the correct answer and a full explanation.
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4.(d)(i) State the trend in the boiling points of chlorine, bromine and iodine. (ii) Explain briefly why water has a higher boiling point than ammonia.
Model answer
(i) Boiling points increase down the group: Chlorine < Bromine < Iodine. (ii) Both NH₃ and H₂O have appreciably high boiling points due to hydrogen bonding, but the hydrogen bonding in water is stronger than in ammonia because oxygen is more electronegative than nitrogen, so water has the higher boiling point.
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