WAEC Chemistry 2019 Theory — Question 7

Question 7 of 28 from the West African Examinations Council (WAEC) Chemistry 2019 Theory paper, with the correct answer and a full explanation.

1(g) State the two products formed when chlorine water is exposed to sunlight. [2 marks]

Model answer

When chlorine water is exposed to sunlight, it decomposes to give hydrochloric acid (HCl) and oxygen (O2): Cl2 + H2O → HCl + HOCl, then HOCl →(sunlight)→ HCl + ½O2. The two products are HCl and O2.

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