WAEC Chemistry 2019 Theory — Question 17
Question 17 of 28 from the West African Examinations Council (WAEC) Chemistry 2019 Theory paper, with the correct answer and a full explanation.
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3(c) Consider the following metals: Na, Fe, K and Cu. (i) Arrange the metals in order of increasing reactivity. (ii) Which of the metals will react with cold water? (iii) Which of the metals could form coloured salts? [3 marks]
Model answer
(i) Increasing reactivity: Cu < Fe < Na < K (ii) Only sodium (Na) and potassium (K) react with cold water. (iii) Copper (Cu) will form coloured salts, since it is a transition element.
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