Identification of ions and gases

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1 For more awesome GSE and level resources, visit us at Identification Of ions nd Gases Question Paper Level Subject Exam oard Topic Sub-Topic ooklet O Level hemistry ambridge International Examinations Experimental hemistry Identification of ions and gases Question Paper Time llowed: 58 minutes Score: /48 Percentage: /100

2 For more awesome GSE and level resources, visit us at 1 Four gas jars each contain one of the gases ammonia, chlorine, hydrogen chloride and oxygen. strip of damp blue litmus paper and a strip of damp red litmus paper are placed in each jar. In which gas jar will both the damp blue litmus paper and the damp red litmus paper change colour? ammonia chlorine red litmus blue litmus red litmus blue litmus hydrogen chloride oxygen red litmus blue litmus red litmus blue litmus

3 For more awesome GSE and level resources, visit us at 2 The scheme shows a sequence of reactions starting from compound Y. compound Y excess HNO 3 (aq) gas + colourless solution NaOH(aq) white precipitate insoluble in excess NaOH(aq) What could the compound Y be? aluminium sulfate calcium carbonate copper(ii) carbonate zinc carbonate 3 student mixed together aqueous solutions of Y and Z. white precipitate formed. Which could not be Y and Z? Y hydrochloric acid hydrochloric acid sodium chloride sodium chloride Z silver nitrate sodium nitrate lead(ii) nitrate silver nitrate

4 For more awesome GSE and level resources, visit us at 4 liquid reacts with each of sodium carbonate, potassium hydroxide and ethanol. What is the liquid? aqueous ammonia ethanoic acid ethyl ethanoate sodium hydroxide 5 Which compound, on combustion, never forms carbon? carbon monoxide ethanol ethene methane 6 Which compound when in aqueous solution will produce a red / brown precipitate on the addition of an aqueous solution of Fe 3+ ions? hydrogen chloride sodium chloride sodium hydroxide sulfur trioxide 7 Sulfur is burnt in air. Which statement about this reaction is correct? The gas formed turns aqueous potassium dichromate(vi) from green to orange. The product is used as a food preservative. The reaction is endothermic. The reaction is reversible.

5 For more awesome GSE and level resources, visit us at 8 In which pair do neither of the gases change the colour of damp blue litmus paper? ammonia and hydrogen ammonia and hydrogen chloride carbon dioxide and chlorine carbon dioxide and sulfur dioxide 9 queous silver nitrate is added to separate solutions of potassium chloride and sodium iodide. What are the colours of the precipitates formed? colour of precipitate formed with chloride colour of precipitate formed with iodide white white white yellow yellow white yellow yellow

6 For more awesome GSE and level resources, visit us at 10 When pure gas X was passed through the apparatus shown, the copper(ii) oxide turned pink and the limewater stayed colourless. copper(ii) oxide colourless gas X heat ice colourless liquid formed limewater water What is gas X? carbon dioxide carbon monoxide hydrogen nitrogen 11 The addition of dilute acid to a solution containing the anion Q and the subsequent use of limewater can be used to identify the anion Q. What is Q? a carbonate a chloride an iodide a sulfate 12 Which ion reacts with aqueous ammonia to give a precipitate that dissolves in an excess of ammonia? l 3+ (aq) Fe 2+ (aq) Fe 3+ (aq) Zn 2+ (aq)

7 For more awesome GSE and level resources, visit us at 13 Which statement about aqueous sodium chloride is correct? It contains sodium atoms. It contains two different types of molecules. It does not conduct electricity. It forms a white precipitate when added to aqueous silver nitrate. 14 Substance Q is a soluble salt. n aqueous solution of Q is tested as shown. test warm Q with aqueous sodium hydroxide to Q add dilute nitric acid and barium nitrate solution observation alkaline gas given off, no precipitate formed white precipitate forms What is Q? ammonium chloride ammonium sulfate zinc chloride zinc sulfate 15 mixture of two gases has no effect on either damp blue litmus paper or damp red litmus paper. Which gases are present in the mixture? ammonia and oxygen carbon dioxide and sulfur dioxide chlorine and hydrogen hydrogen and oxygen

8 For more awesome GSE and level resources, visit us at 16 The diagrams show an experiment with aqueous ammonium chloride. poured in moist litmus paper solution X aqueous ammonium chloride mixture heat gas, Y, is produced and the litmus paper changes colour. What are solution X and gas Y? solution X aqueous sodium hydroxide aqueous sodium hydroxide dilute sulfuric acid dilute sulfuric acid gas Y ammonia chlorine ammonia chlorine 17 student tested a solution by adding aqueous sodium hydroxide. precipitate was not seen because the reagent was added too quickly. What could not have been present in the solution? l 3+ a 2+ NH 4 + Zn 2+

9 For more awesome GSE and level resources, visit us at 18 solution of fertiliser was tested as shown. add excess aqueous sodium hydroxide solution moist red litmus paper turns blue fertiliser solution green precipitate forms warm the mixture Which ions must be present in the fertiliser? 2+ Fe and SO Fe and NO 3 + NH 4 and Fe 2+ + NH 4 and NO 3 19 The labels fell off two bottles each containing a colourless solution, one of which was sodium carbonate solution and the other was sodium chloride solution. The addition of which solution to a sample from each bottle would most readily enable the bottles to be correctly relabelled? ammonia hydrochloric acid lead(ii) nitrate sodium hydroxide

10 For more awesome GSE and level resources, visit us at 20 mmonium sulfate and potassium sulfate are salts which can be found in fertilisers. sample of a fertiliser is warmed with aqueous sodium hydroxide and a gas with ph10 is given off. Which salt must be in the fertiliser and which gas is given off? salt in fertiliser ammonium sulfate ammonium sulfate potassium sulfate potassium sulfate name of gas ammonia sulfur dioxide ammonia sulfur dioxide 21 sample of tap water gave a white precipitate with acidified silver nitrate. What does this show about the tap water? It contained chloride. It contained harmful microbes. It contained nitrates. It had not been filtered. 22 Which is an anion that is present in the solution formed when an excess of dilute hydrochloric acid is added to calcium carbonate? a 2+ l 2 O3 H + 23 metal reacts with dilute hydrochloric acid to produce a gas. What is used to identify this gas? a glowing splint a lighted splint damp blue litmus paper limewater

11 For more awesome GSE and level resources, visit us at 24 Titration of an acid against a base is a method often used in the preparation of salts. Which properties of the acid, the base and the salt are required if this method is to be used? 25 Substance X dissolves in water to form a colourless solution. This solution reacts with aqueous lead(ii) nitrate in the presence of dilute nitric acid to give a yellow precipitate. What is substance X? calcium iodide copper(ii) chloride iron(ii) iodide sodium chloride

12 For more awesome GSE and level resources, visit us at 26 Using the apparatus shown, chlorine is passed through the tube. potassium bromide potassium iodide P Q R chlorine gentle heat fter a short time, coloured substances are seen at P, Q and R. What are these coloured substances? at P at Q at R green gas red brown vapour violet vapour green gas violet vapour black solid red brown vapour violet vapour black solid violet vapour red brown vapour red brown vapour 27 arbon dioxide and carbon monoxide are both absorbed by sodium hydroxide. colourless. inflammable in air. lighter than air. 28 Which reagent could be used to distinguish between dilute nitric acid and dilute hydrochloric acid? aqueous barium chloride aqueous silver nitrate aqueous sodium hydroxide copper(ii) carbonate

13 For more awesome GSE and level resources, visit us at 29 Which is a property of aqueous potassium iodide? It does not conduct electricity. It is a purple solution. It is decolourised by chlorine. It reacts with aqueous bromine to form iodine. 30 Solution X contains a simple salt. The table shows the results of some tests on solution X. test addition of aqueous sodium hydroxide addition of acidified barium nitrate observation green precipitate forms white precipitate forms What is the name of the salt in solution X? iron(ii) chloride iron(iii) chloride iron(ii) sulphate iron(iii) sulphate

14 For more awesome GSE and level resources, visit us at 31 The diagram shows a simple laboratory apparatus for the preparation and collection of a dry gas. anhydrous calcium chloride What is the gas? carbon dioxide chlorine hydrogen hydrogen chloride 32 Gas X What is gas X? has no effect either on damp red litmus paper or on damp blue litmus paper, puts out both a glowing splint and a burning splint. ammonia carbon dioxide chlorine nitrogen

15 For more awesome GSE and level resources, visit us at 33 Solid ammonium chloride decomposes on heating according to the following equation. NH 4 l(s) NH 3 (g) + Hl(g) damp red litmus paper porous plug solid ammonium chloride heat Which change occurs to the damp red litmus paper in the experiment above? remains red turns blue and is then bleached turns blue and remains blue turns blue and then turns red 34 ompound X reacts with some metals to liberate hydrogen and is used to make fertilisers. It gives a white precipitate when added to aqueous barium nitrate. What is X? ammonium sulphate hydrochloric acid potassium nitrate sulphuric acid 35 n aqueous solution of zinc chloride is tested with various reagents. Which observation is correct? cidified barium nitrate solution gives a white precipitate. queous ammonia gives a white precipitate soluble in excess of the reagent. opper turnings precipitate zinc. Sodium hydroxide solution gives a white precipitate insoluble in excess of the reagent.

16 For more awesome GSE and level resources, visit us at 36 Which cation, on reaction with aqueous sodium hydroxide, forms a precipitate that dissolves in excess sodium hydroxide? a 2+ u 2+ Fe 3+ Zn Element R reacts with oxygen to form a gas, T. T changes the colour of damp litmus paper from blue to red. T is used to kill bacteria in the preservation of dried fruit. What is R? carbon chlorine nitrogen sulphur 38 n aqueous solution of compound X reacts with aqueous sodium hydroxide to form a green precipitate and then aluminium powder is added. The mixture is heated and a gas that turns damp red litmus paper blue is given off. What is X? ammonium nitrate copper(ii) chloride iron(ii) nitrate iron(iii) chloride

17 For more awesome GSE and level resources, visit us at 39 The scheme shows some reactions of a compound Y. compound Y excess HNO (aq) 3 gas + colourless solution NaOH(aq) white precipitate insoluble in excess NaOH(aq) What could the compound Y be? aluminium sulphate calcium carbonate copper(ii) carbonate zinc carbonate

18 For more awesome GSE and level resources, visit us at 40 student adds aqueous sodium hydroxide or aqueous ammonia to aqueous solutions of four different metal compounds. Which solution contains Zn 2+ ions? solution add a few drops of NaOH(aq) add excess NaOH(aq) add a few drops of NH 3 (aq) add excess NH 3 (aq) ppt ppt dissolves ppt ppt ppt dissolves ppt ppt ppt no ppt no ppt no ppt no ppt ppt dissolves ppt no ppt no ppt 41 The results of tests carried out on compound X are shown. test dilute hydrochloric acid added warm with aqueous sodium hydroxide result gas given off which turned limewater cloudy gas evolved which turned red litmus blue What is compound X? ammonium carbonate ammonium nitrate calcium carbonate calcium nitrate

19 For more awesome GSE and level resources, visit us at 42 Two tests are carried out on a solution of compound X. test add nitric acid followed by aqueous silver nitrate excess aqueous sodium hydroxide added result white precipitate formed white precipitate formed that does not re-dissolve What is compound X? aluminium chloride aluminium sulphate calcium chloride calcium sulphate 43 When chlorine water is added to a colourless solution of X, a dark brown solution is obtained. What is X? Kl KI Nar NaF 44 One mole of compound X gives three moles of ions in aqueous solution. X reacts with ammonium carbonate to give an acidic gas. What is compound X? calcium hydroxide ethanoic acid sodium hydroxide sulphuric acid

20 For more awesome GSE and level resources, visit us at 45 pale green solution X gives a green precipitate with excess aqueous sodium hydroxide. n alkaline gas is only given off when the mixture is warmed with powdered aluminium. Which ions does X contain? ammonium and copper(ii) ammonium and iron(iii) copper(ii) and nitrate iron(ii) and nitrate 46 The diagrams show mixtures of chemicals that react to produce gases. In which reaction will the litmus paper change colour? damp blue litmus paper damp red litmus paper dilute hydrochloric acid dilute hydrochloric acid zinc damp blue litmus paper sodium carbonate damp red litmus paper aqueous sodium hydroxide aqueous sodium hydroxide ammonium chloride sodium nitrate and aluminium

21 For more awesome GSE and level resources, visit us at 47 The table shows the results of two tests carried out on separate portions of a solution of salt X. test 1 acidified aqueous barium nitrate added 2 aqueous sodium hydroxide added white precipitate observation white precipitate soluble in an excess of aqueous sodium hydroxide What is X? calcium chloride iron(ii) sulphate lead(ii) nitrate zinc sulphate 48 salt is dissolved in water. The results of two separate tests on it are shown in the table. 1 2 test add aqueous ammonia add dilute nitric acid then aqueous barium nitrate result a white precipitate which dissolves when an excess of aqueous ammonia is added a white precipitate What is the salt? aluminium chloride aluminium sulphate zinc chloride zinc sulphate

22 For more awesome GSE and level resources, visit us at

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