Preparation of Salts Quiz
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5 questions, one answer each
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1. Which of the following salts is insoluble in water?
- A. Sodium chloride
- B. Potassium nitrate
- C. Silver chloride
- D. Ammonium sulfate
2. What is the key difference between a hydrated substance and an anhydrous substance?
- A. Hydrated substances contain nitrogen; anhydrous substances do not
- B. Hydrated substances are chemically combined with water; anhydrous substances contain no water
- C. Hydrated substances are liquids; anhydrous substances are solids
- D. Hydrated substances are more soluble than anhydrous substances
3. A student prepares a soluble salt by reacting excess dilute hydrochloric acid with zinc carbonate. What steps are necessary to obtain pure, dry crystals of the salt?
- A. Filter the mixture and evaporate the filtrate to dryness
- B. Filter to remove excess zinc carbonate, then evaporate the filtrate to crystallise the salt
- C. Heat the mixture strongly to decompose any remaining carbonate
- D. Add sodium hydroxide solution until the pH is neutral, then evaporate
4. Which of the following combinations would produce an insoluble salt by precipitation?
- A. Silver nitrate solution and sodium chloride solution
- B. Barium chloride solution and potassium sulfate solution
- C. Sodium carbonate solution and potassium nitrate solution
- D. Lead chloride solution and ammonium sulfate solution
5. In the formula CuSO₄·5H₂O, what does the '5H₂O' represent, and what is the name of this water?
- A. Five separate water molecules that can be easily removed by heating; this is hydration water
- B. Five water molecules of crystallisation chemically combined within the crystal structure
- C. Five hydroxide ions bound to the copper sulfate molecule
- D. Five additional sulfate groups in the crystal lattice