WAEC Chemistry 2018 Objective — Question 28
Question 28 of 50 from the West African Examinations Council (WAEC) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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Cu and HNO₃ are not suitable for preparing hydrogen gas because of their
- A. reactivity and oxidation respectivelyCorrect
- B. conductivity and corrosiveness respectively
- C. melting point and reduction respectively
- D. electronegativity and solubility respectively
Explanation
Copper is too unreactive (below hydrogen in the electrochemical series) to displace hydrogen, while HNO₃'s strong oxidizing nature converts any hydrogen produced into water instead.
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