Salt Preparation And Qualitative Analysis (Zhengkang Jinan)
This quiz is about QA and salt preparation. It is best if you have viewed the videos in the website.
- 1.
Which of the following is not soluble?
- A.
Sodium Nitrate
- B.
Potassium carbonate
- C.
Copper hydroxide
- D.
Ammonium Iodide
Correct Answer
C. Copper hydroxideExplanation
Copper hydroxide is not soluble because it is an insoluble compound. Insoluble compounds do not dissolve in water and instead form a precipitate. Copper hydroxide is a blue solid that forms when a solution containing copper ions reacts with a base.Rate this question:
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- 2.
A salt that is an oxide/hydroxide is called a/an:
- A.
Acid
- B.
Alkali
- C.
Base
- D.
Ion
Correct Answer
C. BaseExplanation
A salt that is an oxide/hydroxide is called a base because bases are substances that can accept protons or donate hydroxide ions in a chemical reaction. Oxides and hydroxides are examples of bases as they can react with acids to form salts and water. Therefore, a salt that is an oxide/hydroxide would fall under the category of a base.Rate this question:
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- 3.
Which of the following is NOT a method of preparing soluble salts?
- A.
Metal-Acid reaction
- B.
Titration
- C.
Carbonate-Acid reaction
- D.
Precipitation
Correct Answer
D. PrecipitationExplanation
Precipitation is not a method of preparing soluble salts because it involves the formation of insoluble salts. In precipitation, two soluble salts react together to form an insoluble salt, which then precipitates out of the solution. The other methods mentioned, such as metal-acid reaction, carbonate-acid reaction, and titration, all involve the formation of soluble salts through various chemical reactions.Rate this question:
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- 4.
Most soluble salt crystals are prepared by crystallisation. One that is not is:
- A.
Sodium Chloride
- B.
Ammonium Iodide
- C.
Gold Nitrate
- D.
Potassium Hydroxide
Correct Answer
A. Sodium ChlorideExplanation
Sodium chloride is not prepared by crystallization because it is a highly soluble salt that is commonly found in nature as a mineral called halite or rock salt. It is obtained through mining or by evaporating seawater. Crystallization is a process used to purify and obtain solid crystals of a substance from a liquid solution, but in the case of sodium chloride, it is not necessary as it is already available in a pure form.Rate this question:
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- 5.
The metal-acid reaction shown in the video is:
- A.
Silver+Nitric acid
- B.
Gold+Nitric acid
- C.
Silver+Hydrochloric acid
- D.
Silver+Ethanoic acid
Correct Answer
A. Silver+Nitric acidExplanation
The correct answer is Silver+Nitric acid. This can be inferred from the information given in the question, which states that the metal-acid reaction shown in the video involves Silver and Nitric acid.Rate this question:
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- 6.
Which of the following is NOT prepared by titration?
- A.
Sodium Sulfate
- B.
Potassium Chloride
- C.
Rubidium Nitrate
- D.
Sodium Hydroxide
Correct Answer
D. Sodium HydroxideExplanation
Sodium hydroxide is not prepared by titration because titration is a technique used to determine the concentration of a solution by reacting it with a solution of known concentration. Sodium hydroxide is typically prepared by the electrolysis of sodium chloride or by the reaction of sodium with water.Rate this question:
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- 7.
Precipitaion is where ______________ reactants are added together to form a solution with a precipitate.
- A.
Two insoluble
- B.
Two basic
- C.
Two soluble
- D.
Two acidic
Correct Answer
C. Two solubleExplanation
When two soluble reactants are added together, they undergo a chemical reaction that forms a solution with a precipitate. A precipitate is a solid that forms from the reaction of two soluble substances. In this case, the reactants are both soluble, meaning that they dissolve easily in water. However, when they are mixed together, a chemical reaction occurs and a solid precipitate is formed, indicating that the reaction has taken place.Rate this question:
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- 8.
9. It is impossible to directly react an insoluble compound to prepare an insoluble salt as a/an _______ would be formed around the compound, preventing further reaction.
- A.
Coating
- B.
Cover
- C.
Cap
- D.
Block
Correct Answer
A. CoatingExplanation
When an insoluble compound is reacted to prepare an insoluble salt, a coating would be formed around the compound, preventing further reaction. This coating acts as a barrier, preventing any additional reactions from occurring. Therefore, the correct answer is "coating".Rate this question:
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- 9.
Heating to saturation, cooling and filtering is called
- A.
Heat forcing
- B.
Crystallisation
- C.
Evaporation to dryness
- D.
Filtration
Correct Answer
B. CrystallisationExplanation
Heating a solution to saturation allows for the maximum amount of solute to dissolve in the solvent. Cooling the solution causes the solute to come out of solution and form crystals, which can then be separated from the remaining liquid through filtration. This process is known as crystallisation.Rate this question:
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- 10.
Insoluble base-acid reaction forms:
- A.
Salt, Carbon Dioxide and water
- B.
Salt and water
- C.
Salt, Ammonia and water
- D.
Salt and hydrogen
Correct Answer
B. Salt and waterExplanation
When an insoluble base reacts with an acid, it forms a salt and water. In this reaction, the base and acid combine to produce a salt, which is a compound formed when the hydrogen ion from the acid is replaced by a metal ion from the base. Additionally, water is also produced as a byproduct of the reaction. Therefore, the correct answer is "Salt and water."Rate this question:
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Mar 15, 2023Quiz Edited by
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Mar 16, 2010Quiz Created by
Tanzhengkang