In the reaction setup shown above, which of the following are true? I. This setup can be used to prepare a soluble gas by water displacement. II. This setup involves a decomposition reaction if the substance heated is potassium chlorate. III. This setup can be used to prepare an insoluble gas by water displacement.
Correct answer: D. II and III
- A. I only
- B. II only
- C. I and III
- D. II and III
- E. I, II, and III
Explanation
This setup can be used to prepare an insoluble gas but not a soluble one. If the substance is potassium chlorate, it does decompose into potassium chloride and oxygen.
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About Experimental Techniques in Chemistry
Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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