Chemistry e learning quiz


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Chemistry e learning quiz

  1. 1. Chemistry E-Learning Quiz1. Under suitable conditions, dilute nitric acid reacts with each of the followingsubstances.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 nitrate2. An excess of dilute sulfuric acid reacts with both aqueous calcium hydroxide and aqueouscalcium 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 produced3. The ionic equation for a reaction is shown below:Ba 2+ + SO42- ->BaSO4.This reaction takesplace readily whenChoose 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 acid5. After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silvernitrate to give a white precipitate. What could X be?Choose one answer.
  2. 2. a. calcium iodide b. copper(II) chloride c. lead(II) iodide d. sodium chloride6. A salt is dissolved in water. The results of two separate tests on it are shown in the table. test result1 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 chlorideWhat is the salt?Choose one answer. a. Aluminium chloride b. Aluminium sulfate c. Zinc chloride d. Zinc sulfate7. Which of the following reagents could be used to distinguish between dilute nitric acid anddilute hydrochloric acid?Choose one answer. a. aqueous barium chloride b. copper(II) carbonate c. aqueous silver nitrate d. aqueous sodium hydroxide8. 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 colourlesssolution of Z.What are the formulae of X, Y and Z? X Y ZA CaCO3 Ca(OH)2 Ca(HCO3)2B Ca(OH)2 CaCO3 Ca(HCO3)2C Ca(OH)2 Ca(HCO3)2 CaCO3D CaCO3 Ca(HCO3)2 CaCO3Choose one answer.
  3. 3. a. A b. B c. C d. D9. 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. Oxygen10. A solid Z is insoluble in water. It gives off a gas when heated and also when treated withdilute sulfuric acid. What is substance Z?Choose one answer. a. Carbon b. Sulfur c. Zinc oxide d. Copper(II) carbonate11. A sample of polluted air was analysed to identify its components. Which of the followingstatements 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 aqueousmixture, only a blue precipitate is formed which dissolves in excess aqueous ammonia to form adeep blue solution. The two cations areACu2+, Zn2+
  4. 4. BCu2+, Fe2+CCu2+, Ca2+DFe2+, Al3+Choose one answer. a. A b. B c. C d. D13. 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 acid14. 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 excessWhat is the correct formula of the ionic compound?Choose one answer. a. ZnSO4 b. ZnCl2 c. Al2(SO4)3 d. AlCl3
  5. 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 beChoose one answer. a. barium chloride b. silver nitrate c. lead(II) nitrate d. zinc chloride16. Which of the following pairs of substances will produce a precipitate when their aqueoussolutions are mixed?Choose one answer. a. calcium nitrate + sodium chloride b. sodium nitrate + ammonium carbonate c. sodium sulfate + barium nitrate d. sodium nitrate + silver chloride17. The following tests were carried out on different samples of solution X.No. Test Results1 Addition of excess sodium hydroxide White precipitate formed2 Addition of aqueous lead(II) nitrate White precipitate formed Boil the mixture obtained and allow to cool White crystals are formedWhich 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. 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 isChoose one answer. a. zinc iodide b. calcium chloride c. magnesium sulfate d. potassium sulfate19. 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 hisprocedures so that he could obtain the pure salt?He was not successful in his attempt. Which ofthe 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. 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 acid22. Which of the following salts cannot be prepared by a reaction between a dilute acid and ametal?Choose one answer. a. Calcium chloride b. Copper(II) chloride c. Iron(II) chloride d. Magnesium sulfate23. 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 nitrate24. A salt with the formula XY is to be prepared by reacting the acid HY with an excess of theinsoluble 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. 8. 25. Barium sulfate is used in a ‘barium meal” to allow X-ray studies for the intestines. Whichtwo 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