Identification of Ions and Gases

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1 Identification of Ions and Gases Question Paper 1 Level IGSE Subject hemistry (0620/0971) Exam oard ambridge International Examinations (IE) Topic cids, bases and salts Sub-Topic Identification of ions and gases ooklet Question Paper 1 Time llowed: 34 minutes Score: /28 Percentage: /100 Grade oundaries: >85% 75% 68% 60% 53% 48% % 33% <25%

2 1. n aqueous solution Y contains both barium ions and silver ions. In separate experiments, dilute sulfuric acid and dilute hydrochloric acid are added to solution Y. Which of these acids causes a precipitate to form in solution Y? dilute sulfuric acid dilute hydrochloric acid 2. Some reactions of a substance, R, are shown in the diagram. magnesium hydrogen substance R reacts with sodium carbonate carbon dioxide copper(ii) oxide copper(ii) sulfate What type of substance is R? an acid a base an element a salt 2

3 3. The graph shows how the ph of soil in a field changed over time. t which point was the soil neutral? 11 9 ph of soil time 4. Some barium iodide is dissolved in water. queous lead(ii) nitrate is added to the solution until no more precipitate forms. This precipitate, X, is filtered off. ilute sulfuric acid is added to the filtrate and another precipitate, Y, forms. What are the colours of precipitates X and Y? 3

4 5. solution contains barium ions and silver ions. What could the anion be? chloride only nitrate only sulfate only chloride or nitrate or sulfate 6. Which is not a typical property of an acid? They react with alkalis producing water. They react with all metals producing hydrogen. They react with carbonates producing carbon dioxide. They turn litmus paper red. 7. The results of three s on a solution of compound X are shown. aqueous sodium hydroxide added aqueous ammonia added dilute hydrochloric acid added result white precipitate formed, soluble in excess white precipitate formed, soluble in excess bubbles of gas What is compound X? aluminium carbonate aluminium chloride zinc carbonate zinc chloride 4

5 8. When sodium reacts with water, a solution and a gas are produced. sodium water The solution is ed with litmus paper and the gas is ed with a splint. What happens to the litmus paper and to the splint? litmus paper blue to red blue to red red to blue red to blue splint glowing splint relights lighted splint pops glowing splint relights lighted splint pops 9. solution contains barium ions and silver ions. What could the anion be? chloride only nitrate only sulfate only chloride or nitrate or sulfate 5

6 10. mixture containing two anions was ed and the results are shown below. dilute nitric acid added dilute nitric acid added, followed by aqueous silver nitrate result effervescence of a gas which turned limewater milky yellow precipitate formed Which anions were present? carbonate and chloride carbonate and iodide sulfate and chloride sulfate and iodide 11. The results of three s on a solution of compound X are shown in the table. aqueous sodium hydroxide added aqueous ammonia added acidified silver nitrate added result white precipitate formed, soluble in excess white precipitate formed, insoluble in excess white precipitate formed What is compound X? aluminium bromide aluminium chloride zinc bromide zinc chloride 6

7 12. Four different gases are passed through the apparatus shown. gas in gas out damp red litmus paper damp blue litmus paper Which gas has no effect on either piece of litmus paper? ammonia carbon dioxide chlorine hydrogen 13. queous potassium iodide is added to aqueous silver nitrate. What are the colours of the final precipitate and solution? precipitate solution brown colourless white yellow yellow colourless yellow white 7

8 14. Three gas jars contain carbon dioxide, hydrogen and oxygen, as shown. carbon dioxide hydrogen oxygen Which one of the following s could be used to discover which gas is in each jar? a glowing splint a lighted splint damp blue litmus paper limewater 15. ompound X is ed and the results are shown in the table. aqueous sodium hydroxide is added, then heated gently dilute hydrochloric acid is added result gas given off which turns damp red litmus paper blue effervescence, gas given off which turns limewater milky Which ions are present in compound X? ammonium ions and carbonate ions ammonium ions and chloride ions calcium ions and carbonate ions calcium ions and chloride ions 8

9 16. The cations shown are identified by the colour of the precipitates formed when an excess of an aqueous solution of X is added. cations present iron(ii) (Fe 2+ ) copper(ii) (u 2+ ) iron(iii) (Fe 3+ ) effect of adding an excess of aqueous X green precipitate light blue precipitate red-brown precipitate What is X? ammonia limewater silver nitrate sodium hydroxide 17. queous sodium hydroxide is added to solid X and the mixture is heated. green precipitate is formed and an alkaline gas is given off. Which ions are present in X? + NH 4 and Fe 2+ + NH 4 and Fe 3+ OH and Fe 2+ OH and Fe 3+ 9

10 18. white solid is insoluble in water. When it is added to hydrochloric acid, bubbles of gas are formed. dding aqueous ammonia to the solution formed gives a white precipitate. dding excess aqueous ammonia causes the precipitate to re-dissolve. What is the white solid? aluminium nitrate ammonium nitrate calcium carbonate zinc carbonate 19. n element, X, is a dark grey crystalline solid at room temperature. It has a melting point of 114 and a density of 4.9 g / cm 3. When heated gently it forms a purple vapour. Where in the Periodic Table is X found? 10

11 20. Which two compounds give a white precipitate when their aqueous solutions are mixed? silver nitrate and sodium chloride silver nitrate and sodium iodide sodium hydroxide and copper(ii) sulfate sodium hydroxide and iron(ii) chloride 21. Two s are carried out to identify an aqueous solution of X. 1 queous sodium hydroxide is added and a blue precipitate is produced. What is X? 2 ilute nitric acid is added followed by aqueous silver nitrate and a white precipitate is produced. copper carbonate copper chloride iron(iii) carbonate iron(iii) chloride 22. Which gas relights a glowing splint? ammonia carbon dioxide hydrogen oxygen 11

12 23. Which statement about aqueous sodium hydroxide is correct? When it is added to a solution containing sulfate ions, a white precipitate is formed. When it is added to a solution of copper(ii) ions, a blue precipitate is formed which dissolves in excess to give deep blue solution. When it is added to a solution of iron(ii) ions, a green precipitate is formed which does not dissolve in excess. When it is added to ammonium chloride, a gas is produced which turns blue litmus red. 24. The results of two s on solid X are shown. aqueous sodium hydroxide added acidified silver nitrate added observation green precipitate formed yellow precipitate formed What is X? copper(ii) chloride copper(ii) iodide iron(ii) chloride iron(ii) iodide 25. The following s are carried out on an aqueous solution of salt X. sodium hydroxide solution is added a small piece of aluminium foil is then added to the mixture and the mixture is heated observation a green precipitate is formed which dissolves in excess a gas is given off which turns damp, red litmus paper blue What is X? aluminium nitrate ammonium sulfate chromium(iii) nitrate iron(ii) nitrate 12

13 26. solution containing substance X was ed. The table shows the results. flame acidified silver nitrate solution added result lilac colour yellow precipitate What is X? lithium bromide lithium iodide potassium bromide potassium iodide 27. Methyl orange turns red in the solution formed when substance R reacts with water. What is R? calcium oxide potassium oxide sodium oxide sulfur dioxide 28. substance is heated with aluminium foil in aqueous sodium hydroxide. gas is produced which turns damp, red litmus paper blue. Which anion is present in the substance? carbonate iodide nitrate sulfate 13

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