WAEC Chemistry 2011 Objective — Question 11
Question 11 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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Chlorine, bromine and iodine belong to the same group and
- A. A. are gaseous at room temperature
- B. B. form white precipitate with AgNO3(aq)
- C. C. react violently with hydrogen without heating
- D. D. react with alkaliCorrect
Explanation
Chlorine, bromine and iodine are halogens and they all react with alkalis, e.g. chlorine reacts with hot concentrated NaOH to give a solution of sodium chloride and sodium trioxochlorate(V): 3Cl2 + 6NaOH(aq) → 5NaCl(aq) + NaClO3(aq) + 3H2O.
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