WAEC Chemistry 2025 Objective — Question 16
Question 16 of 50 from the West African Examinations Council (WAEC) Chemistry 2025 Objective paper, with the correct answer and a full explanation.
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Which of the following oxides would form two different types of acids when dissolved in water?
- A. CO2
- B. NO2Correct
- C. SO2
- D. SO3
Explanation
NO2 is a mixed anhydride. It dissolves in water to produce two different acids. When it dissolves in water, it undergoes a disproportionation reaction to produce HNO2 and HNO3: 2NO2 + H2O -> HNO2 + HNO3.
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