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Chemistry E-Learning Quiz
1. Under suitable conditions, dilute nitric acid reacts with each of the following
substances.Which reagent gives a colourless solution only with nitric acid?
Choose one answer.
    a. Calcium carbonate
    b. Iron(II) hydroxide
    c. Potassium hydroxide
    d. Silver nitrate


2. An excess of dilute sulfuric acid reacts with both aqueous calcium hydroxide and aqueous
calcium nitrate. In what way are the two reactions the same?
Choose one answer.
     a. A gas is produced.
     b. An insoluble salt is produced.
     c. The final pH is 7.
     d. Water is produced


3. The ionic equation for a reaction is shown below:Ba 2+ + SO42- ->BaSO4.This reaction takes
place readily when
Choose one answer.
     a. aqueous barium nitrate is added to aqueous sodium sulfate.
     b. molten barium sulfate is cooled until it solidifies.
     c. solid barium chloride is added to dilute sulfuric acid.
     d. solid barium sulfate is heated until it melts.


4. Which reactants could be used safely to prepare potassium chloride?
Choose one answer.
    a. aqueous potassium hydroxide and dilute hydrochloric acid
    b. aqueous potassium sulfate and aqueous sodium chloride
    c. potassium and aqueous sodium chloride
    d. potassium and dilute hydrochloric acid




5. After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silver
nitrate to give a white precipitate. What could X be?
Choose one answer.
a. calcium iodide
     b. copper(II) chloride
     c. lead(II) iodide
     d. sodium chloride


6. A salt is dissolved in water. The results of two separate tests on it are shown in the table.

  test                              result
1 Add aqueous ammonia               A white precipitate which dissolves when
                                    an excess of aqueous ammonia is added.
2 Add dilute hydrochloric acid then A white precipitate
  aqeuous barium chloride

What is the salt?

Choose one answer.
   a. Aluminium chloride
   b. Aluminium sulfate
   c. Zinc chloride
   d. Zinc sulfate


7. Which of the following reagents could be used to distinguish between dilute nitric acid and
dilute hydrochloric acid?
Choose one answer.
     a. aqueous barium chloride
     b. copper(II) carbonate
     c. aqueous silver nitrate
     d. aqueous sodium hydroxide




8. On bubbling carbon dioxide into an aqueous solution of X, a white precipitate, Y, is formed.
This precipitate dissolves when more carbon dioxide is bubbled through, forming a colourless
solution of Z.What are the formulae of X, Y and Z?

  X              Y                       Z
A CaCO3          Ca(OH)2                 Ca(HCO3)2
B Ca(OH)2        CaCO3                   Ca(HCO3)2
C Ca(OH)2        Ca(HCO3)2               CaCO3
D CaCO3          Ca(HCO3)2               CaCO3
Choose one answer.
a. A
    b. B
    c. C
    d. D


9. Which gas is evolved when an alkaline solution of sodium nitrate is warmed with aluminium?
Choose one answer.
    a. Ammonia
    b. Nitrogen
    c. Nitrogen dioxide
    d. Oxygen


10. A solid Z is insoluble in water. It gives off a gas when heated and also when treated with
dilute sulfuric acid. What is substance Z?
Choose one answer.
     a. Carbon
     b. Sulfur
     c. Zinc oxide
     d. Copper(II) carbonate




11. A sample of polluted air was analysed to identify its components. Which of the following
statements is a possible conclusion from the tests conducted?
Choose one answer.
     a. Carbon monoxide was present as the polluted air formed a white precipitate in limewater.
     b. Sulfur dioxide was present as the polluted air turned acidified potassium dichromate(VI)
     green.
     c. Nitrogen dioxide was present as the polluted air turned litmus red.
     d. Lead was present as the polluted air formed a yellow precipitate with hydrochloric acid.


12. A blue mixture contains two cations. When aqueous ammonia is added to the aqueous
mixture, only a blue precipitate is formed which dissolves in excess aqueous ammonia to form a
deep blue solution. The two cations are

ACu2+, Zn2+
BCu2+, Fe2+
CCu2+, Ca2+
DFe2+, Al3+
Choose one answer.
    a. A
    b. B
    c. C
    d. D


13. The label fell off two bottles. One bottle was known to contain sodium chloride and the other
    sodium nitrate. Which of the following reagent would most easily identify the solution?

Choose one answer.

    a. Addition of blue litmus paper

    b. Addition of aqueous ammonia

    c. Addition of aqueous silver nitrate

    d. Addition of dilute sulfuric acid




14. An ionic compound gave the following results on testing.

I) It forms a white precipitate with aqueous silver nitrate.

II) It forms a white precipitate with aqueous ammonia which is soluble in excess

What is the correct formula of the ionic compound?

Choose one answer.

    a. ZnSO4

    b. ZnCl2

    c. Al2(SO4)3

    d. AlCl3
15. When hydrochloric acid is added to solution T, no reaction is observed. When sulfuric acid is
    added to solution T, a white precipitate is formed. Solution T could be

Choose one answer.

    a. barium chloride

    b. silver nitrate

    c. lead(II) nitrate

    d. zinc chloride

16. Which of the following pairs of substances will produce a precipitate when their aqueous
solutions are mixed?
Choose one answer.
     a. calcium nitrate + sodium chloride
     b. sodium nitrate + ammonium carbonate
     c. sodium sulfate + barium nitrate
     d. sodium nitrate + silver chloride




17. The following tests were carried out on different samples of solution X.

No. Test                                        Results
1 Addition of excess sodium hydroxide           White precipitate formed
2 Addition of aqueous lead(II) nitrate          White precipitate formed
    Boil the mixture obtained and allow to cool White crystals are formed

Which of the following could salt X be?

Choose one answer.
   a. Lead(II) iodide
   b. Lead(II) chloride
   c. Aluminium chloride
   d. Calcium chloride
18. A solution Y gave a white precipitate when aqueous sodium hydroxide was added. However,
when silver nitrate solution was added to an acidified solution of Y, a white precipitate formed.
The substance is
Choose one answer.
     a. zinc iodide
     b. calcium chloride
     c. magnesium sulfate
     d. potassium sulfate




19. A pupil carried out the following procedure to prepare pure magnesium chloride

(i) Add excess magnesium carbonate to hydrochloric acid.

(ii) Heat the solution to saturation point.

(iii) Filter, wash and dry the crystals.

He was not successful in his attempt. Which of the following corrections should he make to his
procedures so that he could obtain the pure salt?He was not successful in his attempt. Which of
the following corrections should he make to his procedures so that he could obtain the pure salt?

Choose one answer.
   a. Filter off the excess magnesium carbonate before heating the solution in procedure (ii).
   b. Add excess hydrochloric acid to use up all the carbonate in procedure (i)
   c. Heat the solution to dryness in procedure(ii).
   d. He should not wash the crystal in procedure (iii), as the crystal is soluble in water.


20. A salt always
Choose one answer.
   a. contains ions.
   b. contains water of crystallization.
   c. conducts electricity.
   d. dissolves in water.


21. Which of these sequences of reactions produces the best yield of calcium sulfate?
Choose one answer.
    a. Add dilute nitric acid to calcium carbonate, followed by sulfuric acid
    b. Mixing solid calcium nitrate and solid potassium sulfate
    c. Add dilute sulfuric acid to calcium carbonate
    d. Titrate calcium hydroxide with dilute sulfuric acid




22. Which of the following salts cannot be prepared by a reaction between a dilute acid and a
metal?
Choose one answer.
    a. Calcium chloride
    b. Copper(II) chloride
    c. Iron(II) chloride
    d. Magnesium sulfate


23. Which salt is best prepared by a titration method?
Choose one answer.
    a. Copper(II) sulfate
    b. Lead(II) sulfate
    c. Magnesium sulfate
    d. Sodium nitrate


24. A salt with the formula XY is to be prepared by reacting the acid HY with an excess of the
insoluble carbonate of X. What is a possible identity of salt XY?
Choose one answer.
     a. Potassium nitrate
     b. Zinc chloride
     c. Barium sulfate
     d. Silver chloride
25. Barium sulfate is used in a ‘barium meal” to allow X-ray studies for the intestines. Which
two substances would be suitable for preparing barium sulfate for use in X-ray radiography?
Choose one answer.
     a. Barium chloride and sodium sulfate
     b. Barium nitrate and calcium sulfate
     c. Barium oxide and potassium sulfate
     d. Barium carbonate and sulfuric acid

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Chemistry e learning quiz

  • 1. Chemistry E-Learning Quiz 1. Under suitable conditions, dilute nitric acid reacts with each of the following substances.Which reagent gives a colourless solution only with nitric acid? Choose one answer. a. Calcium carbonate b. Iron(II) hydroxide c. Potassium hydroxide d. Silver nitrate 2. An excess of dilute sulfuric acid reacts with both aqueous calcium hydroxide and aqueous calcium nitrate. In what way are the two reactions the same? Choose one answer. a. A gas is produced. b. An insoluble salt is produced. c. The final pH is 7. d. Water is produced 3. The ionic equation for a reaction is shown below:Ba 2+ + SO42- ->BaSO4.This reaction takes place readily when Choose one answer. a. aqueous barium nitrate is added to aqueous sodium sulfate. b. molten barium sulfate is cooled until it solidifies. c. solid barium chloride is added to dilute sulfuric acid. d. solid barium sulfate is heated until it melts. 4. Which reactants could be used safely to prepare potassium chloride? Choose one answer. a. aqueous potassium hydroxide and dilute hydrochloric acid b. aqueous potassium sulfate and aqueous sodium chloride c. potassium and aqueous sodium chloride d. potassium and dilute hydrochloric acid 5. After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silver nitrate to give a white precipitate. What could X be? Choose one answer.
  • 2. a. calcium iodide b. copper(II) chloride c. lead(II) iodide d. sodium chloride 6. A salt is dissolved in water. The results of two separate tests on it are shown in the table. test result 1 Add aqueous ammonia A white precipitate which dissolves when an excess of aqueous ammonia is added. 2 Add dilute hydrochloric acid then A white precipitate aqeuous barium chloride What is the salt? Choose one answer. a. Aluminium chloride b. Aluminium sulfate c. Zinc chloride d. Zinc sulfate 7. Which of the following reagents could be used to distinguish between dilute nitric acid and dilute hydrochloric acid? Choose one answer. a. aqueous barium chloride b. copper(II) carbonate c. aqueous silver nitrate d. aqueous sodium hydroxide 8. On bubbling carbon dioxide into an aqueous solution of X, a white precipitate, Y, is formed. This precipitate dissolves when more carbon dioxide is bubbled through, forming a colourless solution of Z.What are the formulae of X, Y and Z? X Y Z A CaCO3 Ca(OH)2 Ca(HCO3)2 B Ca(OH)2 CaCO3 Ca(HCO3)2 C Ca(OH)2 Ca(HCO3)2 CaCO3 D CaCO3 Ca(HCO3)2 CaCO3 Choose one answer.
  • 3. a. A b. B c. C d. D 9. Which gas is evolved when an alkaline solution of sodium nitrate is warmed with aluminium? Choose one answer. a. Ammonia b. Nitrogen c. Nitrogen dioxide d. Oxygen 10. A solid Z is insoluble in water. It gives off a gas when heated and also when treated with dilute sulfuric acid. What is substance Z? Choose one answer. a. Carbon b. Sulfur c. Zinc oxide d. Copper(II) carbonate 11. A sample of polluted air was analysed to identify its components. Which of the following statements is a possible conclusion from the tests conducted? Choose one answer. a. Carbon monoxide was present as the polluted air formed a white precipitate in limewater. b. Sulfur dioxide was present as the polluted air turned acidified potassium dichromate(VI) green. c. Nitrogen dioxide was present as the polluted air turned litmus red. d. Lead was present as the polluted air formed a yellow precipitate with hydrochloric acid. 12. A blue mixture contains two cations. When aqueous ammonia is added to the aqueous mixture, only a blue precipitate is formed which dissolves in excess aqueous ammonia to form a deep blue solution. The two cations are ACu2+, Zn2+
  • 4. BCu2+, Fe2+ CCu2+, Ca2+ DFe2+, Al3+ Choose one answer. a. A b. B c. C d. D 13. The label fell off two bottles. One bottle was known to contain sodium chloride and the other sodium nitrate. Which of the following reagent would most easily identify the solution? Choose one answer. a. Addition of blue litmus paper b. Addition of aqueous ammonia c. Addition of aqueous silver nitrate d. Addition of dilute sulfuric acid 14. An ionic compound gave the following results on testing. I) It forms a white precipitate with aqueous silver nitrate. II) It forms a white precipitate with aqueous ammonia which is soluble in excess What is the correct formula of the ionic compound? Choose one answer. a. ZnSO4 b. ZnCl2 c. Al2(SO4)3 d. AlCl3
  • 5. 15. When hydrochloric acid is added to solution T, no reaction is observed. When sulfuric acid is added to solution T, a white precipitate is formed. Solution T could be Choose one answer. a. barium chloride b. silver nitrate c. lead(II) nitrate d. zinc chloride 16. Which of the following pairs of substances will produce a precipitate when their aqueous solutions are mixed? Choose one answer. a. calcium nitrate + sodium chloride b. sodium nitrate + ammonium carbonate c. sodium sulfate + barium nitrate d. sodium nitrate + silver chloride 17. The following tests were carried out on different samples of solution X. No. Test Results 1 Addition of excess sodium hydroxide White precipitate formed 2 Addition of aqueous lead(II) nitrate White precipitate formed Boil the mixture obtained and allow to cool White crystals are formed Which of the following could salt X be? Choose one answer. a. Lead(II) iodide b. Lead(II) chloride c. Aluminium chloride d. Calcium chloride
  • 6. 18. A solution Y gave a white precipitate when aqueous sodium hydroxide was added. However, when silver nitrate solution was added to an acidified solution of Y, a white precipitate formed. The substance is Choose one answer. a. zinc iodide b. calcium chloride c. magnesium sulfate d. potassium sulfate 19. A pupil carried out the following procedure to prepare pure magnesium chloride (i) Add excess magnesium carbonate to hydrochloric acid. (ii) Heat the solution to saturation point. (iii) Filter, wash and dry the crystals. He was not successful in his attempt. Which of the following corrections should he make to his procedures so that he could obtain the pure salt?He was not successful in his attempt. Which of the following corrections should he make to his procedures so that he could obtain the pure salt? Choose one answer. a. Filter off the excess magnesium carbonate before heating the solution in procedure (ii). b. Add excess hydrochloric acid to use up all the carbonate in procedure (i) c. Heat the solution to dryness in procedure(ii). d. He should not wash the crystal in procedure (iii), as the crystal is soluble in water. 20. A salt always
  • 7. Choose one answer. a. contains ions. b. contains water of crystallization. c. conducts electricity. d. dissolves in water. 21. Which of these sequences of reactions produces the best yield of calcium sulfate? Choose one answer. a. Add dilute nitric acid to calcium carbonate, followed by sulfuric acid b. Mixing solid calcium nitrate and solid potassium sulfate c. Add dilute sulfuric acid to calcium carbonate d. Titrate calcium hydroxide with dilute sulfuric acid 22. Which of the following salts cannot be prepared by a reaction between a dilute acid and a metal? Choose one answer. a. Calcium chloride b. Copper(II) chloride c. Iron(II) chloride d. Magnesium sulfate 23. Which salt is best prepared by a titration method? Choose one answer. a. Copper(II) sulfate b. Lead(II) sulfate c. Magnesium sulfate d. Sodium nitrate 24. A salt with the formula XY is to be prepared by reacting the acid HY with an excess of the insoluble carbonate of X. What is a possible identity of salt XY? Choose one answer. a. Potassium nitrate b. Zinc chloride c. Barium sulfate d. Silver chloride
  • 8. 25. Barium sulfate is used in a ‘barium meal” to allow X-ray studies for the intestines. Which two substances would be suitable for preparing barium sulfate for use in X-ray radiography? Choose one answer. a. Barium chloride and sodium sulfate b. Barium nitrate and calcium sulfate c. Barium oxide and potassium sulfate d. Barium carbonate and sulfuric acid