Q1+2: When calcium carbonate is added to hydrochloric acid a gas is given off and calcium chloride is formed. | |
1. What is the test for the gas produced?
- A. bleaches damp litmus paper
- B. pops with a lit splint
- C. relights a glowing splint
- D. turns limewater milky
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2. What is the formula of calcium chloride?
- A. CaCl
- B. Ca2Cl
- C. CaCl2
- D. Ca2Cl2
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| 3. Dilute hydrochloric acid reacts with sodium hydroxide solution.
What type of reaction is this and which ionic equation correctly represents this reaction? |
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Reaction Type |
Ionic Equation |
| A |
displacement |
H+(aq) + OH-(aq) → H2O |
| B |
neutralisation |
H+(aq) + OH-(aq) → H2O |
| C |
displacement |
Cl-(aq) + Na+(aq) → NaCl(aq) |
| D |
neutralisation |
Cl-(aq) + Na+(aq) → NaCl(aq) |
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| 4. Which statement about ion concentrations in alkalis is true?
An alkali contains..
- A. a greater concentration of hydroxide ions than pure water
- B. a greater concentration of hydrogen ions than pure water
- C. equal concentrations of hydrogen and hydroxide ions
- D. the same concentration of hydroxide ions as pure water
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5. A small amount of ethanoic acid is dissolved in a large volume of water. What is the best description of this solution?
- A. A dilute solution of a strong acid
- B. A weak solution of a concentrated acid
- C. A dilute solution of a weak acid
- D. A weak solution of a dilute acid
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| 6. A solution has a pH of 5. What is the pH of the solution if the hydrogen ion concentration increases by a factor of 100?
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Q7-8:
Some soluble salts such as copper(II)chloride are prepared by adding excess insoluble solid to acid.
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7. Why do you add excess of the insoluble solid?
- A. To ensure that a reaction takes place
- B. To speed up the reaction
- C. To allow the solid to be separated from the solution
- D. To ensure that all the acid is used up
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8. Which technique is used to separate the excess insoluble solid from the reaction mixture?
- A. crystallization
- B. filtration
- C. precipitation
- D. titration
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9. Which of the following would produce a precipitate when they are mixed together?
| I. Sodium chloride and silver nitrate solutions |
| II. Copper(II)sulfate and sodium hydroxide solutions |
| III. Potassium carbonate and magnesium nitrate solutions |
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- A. I and II only
- B. I and III only
- C. II and III only
- D. I, II and III
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10. There are three different methods for preparing pure, dry samples of a salt:
| 1. Adding an excess insoluble solid to acid |
| 2. Adding alkali to acid |
| 3. Precipitation |
Which method is most suitable to prepare each of the salts in the table below? |
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Lead(II)sulfate |
Copper(II)sulfate |
ammonium sulfate |
| A |
3 |
2 |
1 |
| B |
1 |
2 |
3 |
| C |
2 |
1 |
3 |
| D |
3 |
1 |
2 |
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