23. 2017 p1 q12. potassium nitrate liberates oxygen gas when heated. draw a diagram of a set-up that shows heating of potassium nitrate and collection of oxygen gas. (3 marks)

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23. 2017 p1 q12. potassium nitrate liberates oxygen gas when heated. draw a diagram of a set-up that shows heating of potassium nitrate and collection of oxygen gas. (3 marks)

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