(*] 115 COMBINED SCIENCE CHEMISTRY 2019 Multiple choice questions 1. Which diagram represents molecules of hydrogen gas & | [Po] Jaro 8 &| [8°38] jog? ee 8°20} |°8 2.Which substance on the chromatogram is a pure substance? 3 Which process involves a change of state? 4 When liquid water changes into steam, the molecules ‘A break up into small particles. B become very large. ‘C move further apart. D give out heat energy. '5 Which apparatus would be most suitable for measuring 16.75 cm3 of a liquid? A.a bulb pipette B a burette Ca measuring cylinder D a volumetsic flask {6 The diagram shows a chromatogram of the dyes present in five different inks. . oe . . . . . ee $$$ $49 What is the total number of different dyes in all the five inks? A3B4C5DI1 7. The element francium, Fr, is in the same group of the Periodic table as potassium. The formula of francium chloride is likely to be A. FeCl B.FFCI €, FrCh D. Fr Cl, ‘8 A compound contains 33.3% carbon and 66.7% oxygen. ‘The empirical formula of the compound is A.CO;. B.C:05. €.C30;. D. COs 9. A solution of an alkali in water ‘A has a pH less than 7. B turns blue litmus paper red. C contains hydroxide ions. D neutralises a sat to produce an acid. 10. Which property allows substances to be separated by paper chromatography? A. different solubilities B. different colours (C.equal solubilities D, different boiling points ‘LL. The diagram shows the distillation ofa salt solution. ‘At which point would the temperature be equal to the boiling point of water? 12, Graphite conducts electricity because Ait contains electrons that are free to move. it contains protons that are free to move, C the layers of atoms can slide over each other Dit contains impurities. 13 Elements are systematically arranged in the Periodic Table in the order of increasing ‘A. nucleon number. B._ proton number. C.valeney number. D. umber of neutrons, 14 Which pair of atoms has the same number of neutrons? A 1SNand 4 a 2Nema Me ana!S0. © He aalg > 2380 ant 38u 15. The structure of an stom is shown, Which statement about this atom is correct? Ais not a neutral atom, B Tts nucleon number is 1. C thas 4 valency electrons D It forms ions of acharge of +2. 16 Which clement is always found in steel? A carbon Bebromium —Cnickel —D silicon(7) 17. The proton number of clement X is 19. When X forms an ionic compound, the electronic structure of the ion. formed by X is A.2.8,8 B.2,8.8,1. €.2,8,8,2, D.2,.8.8,3 18, Which equation is balanced? ACO+0:>CO, —B 2CO+ 20, > 2CO; €CO+0,>2CO; _D 2CO+0,>2€0. 19. In the manufacture of sulphuric acid by the contact process, the sulphur trioxide is dissolved in A water. B dilute sulphuric acid. C concentrated sulphuric acid. D oleum, 21, Which catalyst is used in the manufacture of nitric acid? ‘A vanadium pentoxide B. platinum C. iron D. nickel 22, One mole of C contsins ‘A. 6.02.10" toms B. 6.02 x 10® molecules 6.02 x 10" atoms D, 6.02 10" molecules 23. The number of moles can be determined by ‘Avmass x mass number B. mass / atomic number C.mass/ mass of one mole D. mass /6.02 x 1023 24, The number in a balanced equation indicates ‘Ahhow many grams of each substances are involved BB the number of atoms taking part in the reaction CC. the number of ions taking part inthe reaction D. the number of moles of each substance 25, The empitical formula of benzene (CsH.) is ACH B.C3Hy CGH; D.CiHy 26, Which statement is not correct? 4 Airis a mixture, B Ammonia is a compound. C Methane is a compound, D Sea water is a compound, 27 An element is in Period 3 and Group VII of the Periodie Table. Which statement about this element is correct? A The element will form 1+ ions B The element will have 3 electrons in its outer shell. € The element will have 7 electrons in its outer shell. D The element will have 7 shells of electrons in its atom 28, Which substance is not a raw material used in the ‘manufacture of sulphuric acid? Air B sulphur € sulphurdioxide D water 29, Halogens are elements in group Al B4 C3 D7 30. A compound is found to have the percentage ‘composition by mas; silicon (Si), 87.5%; hydrogen, 12.5%. What is the empirical formula ofthis compound? (Si = 28, 4 ASiH: BSif SiH, DSisHy 31. Brass is an alloy of ‘lead and tin, B zine and copper. iron and carbon, D iron and aluminium. 32.Which one is not an air pollutant? Anitrogen B carbon monoxide Critrogen oxide D vaporised lead compounds 33, Which clement is used to purify water for domesti purposes? ‘Aiodine B chlorine C fluorine D bromine 34 What type of a compound is formed when an element P(proton number 12) reacts with ‘an element Q(proton number 17) ‘Aa covalent compound of formula PQ B a covalent compound of formula PQs Can ionic compound of formula PQs D anionic compound of formula PQ 35. Group VII elements are also called Auhalogens B, noble gases C. inert gases D. halides 36. Noble gases are unreactive because ‘Axtheir atoms are heavier B their outer shells are completely filled they are bad conductors they are not abundant 37.Foarumpounds a shown ive, AN VL \ ML rT fp edt 1’ ' 2 . ‘ Which pair of compounds have the same empirical formula? Aland2 Bland3 C2and3 D2and4 38, The diagram shows the set up used to coat a metal spoon using copper I ‘The experiment did not work because A there is no variable resistor in the electrical circuit, B copper sulphate solution should not be used as an electrolyte. CC the copper plate should be wholly dipped into the solution D the spoon should be the cathode,{> ] 39. The diagram shows the blast furnace (‘wr 7 \ = } FL ‘What substances enter or leave through A, B and C A B A iron hot sir slag B imn slag hot air © hotair iron slag D waste gases hot air iron 40. The diagram shows a method of producing some Which gas is X? Annitogen B oxygen C hydrogen D carbon dioxide 41. Which phrase is incorrect? ‘Aa molecule of an element B an atom of an element Ca molecule of a compound D an atom of a compound, 42. Which ofthe following statements is correct about A,B and C shown in the Periodic Table below? AThey are in the same group B They are all non-metals € They all have the same number of shells. D They all have the same number of electrons 443. The physical property used in fractional distillation is the difference in ‘A densities ofthe liquids. B boiling points ofthe liquids, CC melting points of the liquids. D heat capacities ofthe liquids. 44. How many moles are there in 3.2g of methane, CH4? (C= 12; H= 1) A02 BS C16 D512 35 37, 45, PCT ana 17CT axe cated isomers. B. isotopes. C. monomers. D. polymers. 46 The diagram show the outermost shell of element Z, Z forms an ion with a charge of AZ6+, BZ2+, C76-.DZ2- 47 Sulphuric acid and calcium hydroxide reacts shown by the equation: HySO 4(ag)+C OH) 2449) °C ASO 4iagy+2H20 0) 1f0.1 moles of sulphuric acid are used, how many moles, of water are produced? A0.1B02C10D20 48 An organic compound contains 84 % casbon(C) and 16 % hydrogen (H) by mass. [atomic mass of C is 12 and that of His 1] ‘What is the empirical formula ofthe organic compound? ACHB CH? CC2HD C2H4 49 Which substance, in exhaust fumes, causes global warming? A.carbon soot B carbon dioxide (C water vapour D carbon monoxide '50 What isthe use of limestone inthe blast furnace? Ato produce slag B to act as a fuel Co produce carbon monoxide D to reduce iron (II) oxide to iron 51 Which diagram, A,B, C, or D, shows the structure of ethane?(*] ‘52. The list shows pat ofthe reactivity series of metals: calcium, ‘magnesium ‘copper What is the position of a metal that eacts vigorously with cold water? A below copper B above calcium € between zinc and copper D between magnesium and zine '53 Which temperature is used in the Haber process? ‘4 200°C B 300°C 450°C D 800°C. ‘54 The equation shows the reaction between iron oxide and ‘carbon monoxide. iron oxide + carbon monoxide iron + carbon dioxide Which is the oxidising agent? Aiiron carbon dioxide Bironoxide —_D earbon monoxide ‘58 The flow diagram shows the manufacture of sulphuric acid, What is X? A water C dilute sulphuric acid B vanadium pentoxide D concentrated sulphuric acid ‘56 The diagram shows the structure of an organic molecule. i ‘To which homologous series docs the molecule belong? alcohols B aldehydes C alkanes D alkenes ‘57. The graph shows a cooling curve of water vapour. Which portion of the graph indicates condensation? A.1102. B.2103 C3104 D.4to5 '58 The flow chant represents stages in the manufacture of| sulphuric acid by the contact process. oryeen 1 tesetion ¥ 7 sy ae fe LS dioxide fp ‘Which conditions are commonly used for reaction Y? ‘Temperature /*C_pressure/atm A 25 1 B 450 1 c 25 200 D 430 200 59, Which Reaction Is Neutralisation? ‘A Zine + Hydrochloric Acid > Zine Chloride + Hydrogen B Calcium Oxide + Water > Calcium Hydroxide C Sodium Hydroxide + Hydrochloric Acid > Sodium Chloride + Water Dron Oxide + Carbon Monoxide > Iron +Carbon Dioxide 660, Which process provides the best evidence for the kinetic theory of matter? A dehydration B diffusion C filtration D neutralisation 61, Which statement describes the conversion of ‘magnesium atoms to magnesium ions? ‘A The change is reduction, because there has been a gain of electrons. [B The change is oxidation, because there has been a loss of electrons, C The change is reduction, because there has been a loss of electrons, D The change is oxidation, because there has been a gain of electrons, (62, The equation Shows a change of state odine crystals ~> iodine gas ‘What is this change A.condensation B. melting C. evaporation. sublimation 6. pred by ecg yd i wih ec ie. Te paps Nene te psn vd mite Seer Posed emt er oon ‘Resgetof rate at msi, Simctgdgenttng eel Monet actos ee tnd Tecoma oe isos{*] ‘64.how is hydrogen gas used in the Haber Process obtained? A. electrolysis of water B. fermentation of sugar C.liquefaction of air. neutralisation of acid {65.In the hottest regions ofthe blast furnace the following reaction takes place. Fe203 4+ 3C-> 2Fe +3CO ‘Which two of these sentences correctly describe this reaction? A .The iron oxide gets reduced, B. The carbon monoxide gets oxidised. C. The carbon gets reduced. D, Carbon neutralises the iron oxide (66, The double bond in alkenes indicates A. alkenes are hydrocarbons B. alkenes are unsaturated CC. alkenes are saturated D. alkenes are less reactive than alkanes 667. Which ofthese is not a hydrocarbon? A.pentane B.ethene C. butane D. ethanol 68. A hydrocarbon is composed of | ‘A.carbon. _B hydrogen C. carbon and hydrogen D. carbon, hydrogen, and nitrogen 669. Eutrophication is caused by a) insecticides (b) pesticides (e)fenilizers, ——_(@) industrial waste 70. Metals usually occur in their ore combined with another element. ‘Which metal is least likely to occur combined with another element? ‘A aluminium B calcium C magnesium D silver 71. Calcium carbonate seacts with hydrochloric acid, producing carbon dioxide gas. CaCO) + 2HCI (aq) — CaCh(aq) + F200) + CO.K@) ‘The rae of this reaction can be measured using the apparatus shown, ‘Which additional piece of apparatus is also required? A. aburette B. a clock C. a gas syringe D. a thermometer 772. Which statement about compounds is comect? A Anionic compound contains two metallic elements bonded together. B Inan ionic compound, metal ions are negatively charged. C When metals combine with non-metal electrons are shared between the atoms. D When two non-metals combine, molecules are formed, 73. Aqueous sodium chloride is electrolysed using the apparatus shown, q fp x What isX? ‘A the anode C the electrode B the cathode D the electrolyte 74. The word equation shows the reaction between substance J and hydrochloric acid. Substance J+ hydeoelave ac mageesium chloride + hydrogen What is substance J? A magnesium B magnesium carbonate (C magnesium hydroxide D magnesium oxide 75. A liquid has A. particles that move ficely, B. a fixed shape, C. particles with the most kinetie energy. D. a fixed volume. 76. The diagram shows the structure of an atom. @—e What is particle G? Aclectron B ion C neutron D proton 77.. Which process represents a chemical reaction? ‘A burning magnesium in air B dissolving salt in water C grinding a lump of limestone D beating ice until it melts 78. What is the positive particle found in an atom? Acleciron Bneutron C nucleus D proton{*] 79, A solid reacted with a liquid to produce @ solution, ‘The mass of the solid reactant was measured at regular intervals ‘Which graph shows the change in mass of the solid with time? mate = me NK = =a or mm — a 80, Most of the carbon monoxide in a blast furnace A reacts with oxygen in the hot air: B reacts with silica. C reacts with oxygen inthe iron ore, D react with calcium carbonate, 81. Which coating method involves dipping iron in molten metal? Aalloying B electroplating C galvanising D painting 82. What happens during the electrolysis of water? A hydroxyl ions move to the cathode B hydrogen ions move to the cathode CC hydrogen ions move to the anode Delectrons move to the anode 83. Which pair of gases has boiling points of = 183C and - 196? A hydrogen and oxygen B ammonia and nitrogen oxygen and nitrogen D hydrogen and nitrogen 84, Which of the following is the displayed structure of ethane? ACoHs B CsHy C CoH D CHy 85. One of these industrial gases is used for steel ‘making, welding and medical treatment. Which gas is this? ‘A carbon dioxide B hydrogen C nitrogen D oxygen 86, What is the general formula of an alkane ACgHy BCpHon CCoHon +1 DCoHon +2 £87. The rate of a eaction can be increased by (a) reducing the concentration of the reactant (b) reducing the surface area of the reactant () increasing the concentration of the reactant (€) none of the above 88, A catalyst helps to (a) increase the rate of a reaction (b) decrease the rate of a reaction () increase the concentration of the reactant (4) increase the volume ofthe reactant 89. A catalyst present in the bodies of humans is called (a) an acid (b) an enzyme (e) an alkali (a) a base 90, A redox reaction is one in which .. (a) oxidation and reduction take place together (b) reduction takes place, but oxidation does nota (@) reduction ocours first, then oxidation (@) reduction occurs after oxidation 91. A reducing agent (a) always contains hydrogen (b) is oxidized in a redox reaction () loses oxygen in a redox reaction (@) is reduced in a redox reaction 92, Iron(II) oxide can be oxidised to form iron(II) oxide, The (ID) and (It) show. (a) the number of iron atoms in the two oxides (b) the number of oxygen atoms added in the oxidation (©) the oxidation state of the irom in the two oxides (4) the nucleon number of the irom in the two oxides 93. The most abundant gas inthe atmosphere is (a) oxygen (carbon dioxide (6) hydrogen (2) nitrogen 94, The Haber process is used to manufacture (a) fertilizers (b) plastics (©) ammonia (a) pesticides 95. Which ofthese is an important constituent of feniizers? (a) nitrogen (b) carbon (©) oxygen (@) water 96. Galvanizing is a process in which iron is coated with another clement. Which element? (a) zine (b) carbon (¢) brass (@) copper{°] 97. Ion is extracted from an ore called (a) galena (b) haematite (©) malachite (@) pyrite 98, Brass is an alloy of (a) copper and aluminium (b) copper and zine (©) aluminium and iron (4) zine and chromium (99. Which ofthese is not a property of metals? (a) lustre (b) malleability () low melting point (A) high density 100, Which of these isthe most reactive? (a) copper (b) iron () calcium (@) potassium 101. When metals react with hydrochloric acid (a) hydrogen is displaced (b) oxygen is produced (©) abase is produced (dl) water is produced 102, Metal oxides are (a) acidic (b) basic () alkaline (@) neutral 103, Sonorous metals can be (a) made to make a ringing sound (b) made into wires (e) made into sheets (d) made to shine 104, Different physical forms of an element are called (b) isotopes (c) allotropes (@) compounds 10 A powdered mixture of metals contains aluminium, calcium, silver and iron. Excess hydrochloric acid is added until no more mixture dissolves, What is the undissolved residue? A aluminium B calcium Ciron Dsilver 106 Iron rusts when exposed to oxygen in the presence of water. Which method will not slow down the rate of rusting of an iron roof? A attaching strips of eopper to it BB coating it with plastic CC galvanising it with zine D painting it 107 Nitrogen is used (a) in advertising signs (b) in tight bulbs (€) to quick-freeze food (4) in respiration 108. Which is a commercial use of hydrogen? ‘A medical purpose B hardening of oils to make margarine Csteel making _D welding and cutting metals 109, Which of these is not a polluting gas? (a) carbon monoxide (b) sulfur dioxide (© nitrogen oxides (4) hydrogen 110.Which of these is an important constituent of fenilizers? A. carbon B.oxygen, C. nitrogen D. water 111.Which reaction is catalysed by vanadium (V) oxide? A sulphur + oxygen > sulphur dioxide B sulphur dioxide + oxygen > sulphur trioxide Sulphur trioxide + sulphuric acid > oleum Doleum + water > sulphuric acid 112.When using a measuring cylinder to Find the volume of a liquid, which ofthe following may lead to inaccurate measurements? AL parallax error zero error C._zero and parallax error D.none ofthe above 113.What is the ervor caused due to instrument sensitivity? A.zero ertor B. parallax exror CC. parallax and zero enor D. common error 114.What are the products of a neutralisation reaction? Aaacid and water B acid and base Case and salt D salt and water us, Tate mat thg tn me, CAR Woon ato te So ed P| tcp pteat | mpe ptad| 0 | rome | rormton R | btopmptent | crm Water cnc lt ts I