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Waec Chem P.Q and Practicals

The document contains a series of multiple-choice questions related to chemistry concepts, including boiling points, chemical reactivity, properties of metals, and gas laws. It also addresses topics such as solubility, reaction equations, and the behavior of solutions. Overall, it serves as a study guide or assessment tool for chemistry knowledge.

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236 views30 pages

Waec Chem P.Q and Practicals

The document contains a series of multiple-choice questions related to chemistry concepts, including boiling points, chemical reactivity, properties of metals, and gas laws. It also addresses topics such as solubility, reaction equations, and the behavior of solutions. Overall, it serves as a study guide or assessment tool for chemistry knowledge.

Uploaded by

timothy
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9 The boiling points of HE, H,O and NH increase in the order of 5 ie A. Nil, <1,0Ch>Bry>h B. 1,Bry>Ch> Py Scanned with CamScanner 12. 13, 14, 16. 7 18, 19. 10 ‘The shape of the water molecule is A. linear, B. pyramidal C. tetrahedral D. V-shaped Which of the following elements would produce coloured ion in aqueous solution? A. Calcium B. Copper C. Magnesium D. Sodium 4 , : , . ai cen reacting particles is known a The minimum amount of energy required for effective collisions between reacting particles is own ay, A. activation energy. B. bond energy. C. kinetic energy. D. potential energy, The bond formed between 11,0 and H1* to form the hydroxonium ion 1,0" is AL dativ | B. covalent, i c. trovalent. D. ion ustrates the law of An element X forms the following oxides XO, XO and XO}. This phenomenon i A. conservation of mass. B. definite proportion. C. mass action. D. multiple proportions. How many moles of oxygen would contain 1.204 x 10%! molecules? 3X [Avogadro's constant (N,) = 6.02 x 10?3 | A B. 2 ica) D4 Which of the followi A. Solid particles are less orderly than those of a liquid B. Solids have lower densities than liquids C. Solid particles have greater kinetic energies than those of liquids D. Solid particles cannot be easily compressed statements about solids is correct?” Which of the following apparatus can be used to measure a specific volume of a li A. Beaker Bs Conical flask C. Measuring eylinder Pipette iquid accurately? Scanned with CamScanner 20. 21. 2. 23. 4. 26. u ‘The general gas equation PY = K isa combination of ‘A. Boyle's and Charles* laws, B, Boyle's and Graham’s laws. CC. Charles’ and Graham's laws. D, _ Dalton’s and Graham’s laws. ‘The spreading of the scent of a flower in a garden is an example of A, Brownian motion. B. diffusion, C. osmosis. D. Tyndal effect. Propane and carbon (IV) oxide diffuse at the same rate because [H=1.00, C= 12.0, O= 16.0] ¥ they are both gases, A. B. their molecules contain carbon C. they have the same relative molecular mass. D. both are denser than air. ‘The energy which accompanies the addition of an electron to an isolated gaseous atom is A. atomization. B, _electronegativity. CC. electron affinity. D. ionization, ‘An aqueous solution of (NH,),S0, is A. acidic. B. alkaline. C.amphoteri D. neutral When NH,Cl,, is dissolved in water, the ‘A. the process is endothermi B. the process is exothermic. (ed solution. Hors a satur 1D. NILjClis highly soluble in water. ‘The pll of four solutions, 1 of the following deductio The pH of N is increased when the solution is diluted A B. The pl of Q is increased when th c. D about the solutions is correct? we solution ise Mis the most alkaline solution Ris the most acidic solution container feels cold to touch. This M,N, Qand Rare 2, 6, 8 and 1 respectively mplies Scanned with CamScanner 27. Consider the following reaction equation + - HO (aq) + OW fag —> 21,0 ‘The reaetion represents A. esterification. B. hydrolysis. C. neutralization, D. redox. 28. The refreshing characteristic taste of fizzy drinks is due to the presence of ‘A. carbon (IV) oxide. B. glucose. C. hydrogen. D. sodium trate. 29, Chemical equilibr ca im is attained when A. all the reactants have been completely used up. B. the reaction goes to completion. CC. the concentration of reactants and products remain constant 1D. the concentration of reactants and produets are equal 30. Which of the following factors will affect the rate of the reaction represented by the following equation? BHI qq) + CACOy,, —F CaClyfaq) + HO + COg¢, . 1 Pr I. Concentration IIL. Nature of reactants IV. Temperature A. Land only B. Il, Ui and 1V only |. Hand 11 only 1.11, Wand IV 31. On evaporation to dryness, 350 cm of saturated solution of salt Z gave 55.5 g of'salt. What is the solubility of the salt? 1Z= 101] * A. 1ST mold 1.3.14 moldar > C. 6.28 mold DB. 12.56 mold 32, Which of the following salts when dissolved in water will form a solution th | blue fiunus tw red? twill change A. CHyCOONa 8. NICH ©. NaCl Kel Scanned with CamScanner 15 45, Which of the following compounds is/are secondary alkanols? 1. CH,CH(CH,)CH,OH Il. CHjCH,CH(OH)CH, IIL, CH,C(OH)(CH,)CH, only Honly Land III only Mand Il only pop> 46. Consider the following reaction equation: Cally 30 4) — 2CO 24g) + 2120, The volume of oxygen at s.1. that will be required to burn 14 g of ethene is [c,] asats.tp. =22.4dm) | A A. 612dn3 B. 33.6 du? Cc. 2dm D. 3.73dnr = 28; Molar volume o! 1 n 47. Which of the following sources of energy contributes 10 the green-house cllcet? A. Natural gas B. Nuclear c. Wind D. Solar 48. Aconsequence of global warming is ‘A. air pollution B. flooding. C. increased humidity. D. water pollution. «is common to both brass and br onze? 49. Which of the following metal: A. Aluminium B. Copper c. Lead D. Iron 4 from the production of soap is 50. The alkanol obt “Ay « dihydric alkanol. tertiary alkanol. yr alkanol Scanned with CamScanner Calculate the relative molecular mass of calcium hydrogen tetraoxosulphate (vp. [Ca= 40, H=1,$=32,0=16] 3 uA. 106 oB. 136 Cc. 137 ee E. 234 Oxygen is used in the following except A. asanaid to breathing, B, in flames for cutting and welding metals. CC. insteel industry for removal of carbon. D. manufacture of ammonia, E, manufacture of trioxonitrate (V) acid. Prost = Pit Pz + Pa sees Pow where Pros is the pressure of a mixture of gases. Which of the gas Jaws does the equation above illustrate? ‘A. Avogadro's B. Boyle's C. — Dalton’s D. — Gay-Lussac’s E, — Graham’s "Which of the following is also referred to as laughing gos? NO NO, N,0 N02 N23 10. MW. 12 13, What mass in grams of anhydrous sodium trioxocarbonate (IV) is present in 500cm* of its 0.1 moldm’ solution? x [Na=23, C= 12, 0= 16] 33 10.6 21.2 42.4 106.0 moom> A mixture of chalk and water can be separated by A. chromatography. B. filtration. C. separating funnel. D. sieving. E, sublimation. Extracting sulphur from the earth's crust can be done by ___ process. A. Bosch B. — Contact, C. — Frasch Dz Haber E, Solvay ‘An example of neutral oxide is A. AbOs. B. — BaQp, Cc CO. D. HAO. E. ZnO. “The fraction of petroleum used for road surfacing is bitumen. diesel oil. ligroin. lubricating oils. petroleum gases. Scanned with CamScanner Steel is an alloy of 19. A. copper and tin, B. Copper and zine, C. ironand carbon, D. ironand nickel], E. lead and tin, When air is passed through concentrated » carbon (IV) oxide is removed, 20. A Her B. iso, C Maso, D. NaOH ENaC, What temperature in Kelvin must a Fear 273K be raised to, in order to double both its pressure and Volume? 2. A. 298 B. 300 C546 De = 19) E. 1092 A gas occupies a Volume of 0.75dm? at 27°C and 0.9mmbig. The volume of the gas at 75°C and same pressure is A 087 2, BL 0.97 C174 D. 1.94 E200 Which of the following methods can be used to prepare insoluble sale AL Crystallization B. Decantation C. Decomposition D. Double decomposition Filtration Given that 1oK, bl, uM and 1gN ape elements of the periodic table, which of the elements belong to the same group? moow Errnn ZZEze 2KClOyy > 2KCly + 30x) The equation above represents the laboratory preparation of A. chlorine, B. hydrogen C. oxygen, D. potassium, E Potassium chloride, The Volume and temperature ofa given mass of gas is 64.Sem? and OC respectively. What willbe the Volume in em? at 100°C given that the pressure remains constant? x A 881 Bo 12.24 C2412 D. 80.18 E3812 Which of the following metas reacts Vigorously with cold water to | displace hydrogen? A AL B. Cu GQ oK 2 D. Mg d E, Zn Scanned with CamScanner 23. 24. 26. 21. In nature, the decomposition of nitrogenous matter to produce ammonia occurs in the presence of AL ir. B. heat, C. oxygen. D. wastes, E, water. ‘The ash used for making black soap isasource of __ ion. A. aluminium B. calcium C. magnesium D. potassium E, sodium ion Phenolphthalein indicator in an alkali solution changes to 30, A. orange. B. pink. Cc. purple. D. ted. E, yellow. Which of the following does not represent one mole of a substance? 3- A. Ogof beryllium 31. B, —Llgofsodium C. 22.4dm* of hydrogen at stp D, — 22.4dm? of oxygen at s..p FE, 32g of sulphur ‘What is the volume in cm? of oxygen required to burn completely 250cm> ¥ of methane? 32. CHa + 207->C On) + 2420) A 025 B. 1250 250.0 D. 500.0 E. 7500 A product formed from the z combustion of pentane in excess air is ‘A. carbon (IV) oxide. B. nitrogen (Il) oxide. C. _ pent-1-ene. D. _ pent-l-ol, E. __pent-l-one, Which of the following group of organic compounds would give an effervescence with sodium hydrogentrioxocarbonate (IV) solution? A. Alkanal B. Alkane C.— Alkanoate D. —Alkanoic acid E.— Alkanone During titration, the following are precautions taken in using a burete except to A, clamp burette on retort stand. B. eject air bubbles from the burette C. rinse the burette with base. D. take readings at eye level. E. wash the burette with water ‘The IUPAC name of CsH/COOCSHh is A. butylethanoate. B. _ethylpropanoate, CC. propylbutanoate. D. _ propylethanoate E. _propylpropanoate. Electrolytic reduction is used to cextfact sodium and potassium because the metals are ‘A, highly reactive, B. inert C. partially reactive. De. unreactive. E, unstable, Scanned with CamScanner 33, uM, 35, 36. 37. The bond angle ofa tetrahedral 38. molecule is A. 90", B, 109°, Cc 120°, D. 150°, BR 180°, Which of the following solve is Not suitable for dissolution of fats? 39, A. Benzene B. Chlorine c ioxyethane D. Tetrachloromethane EB Water he petty of an acid in solution ig due tothe presence of — ions, AL chlorine 40. B. hydrogen c D. sodium EB. sulphur 41. The instrument used in. measuring AH of a reaction is called A. calorimeter, B. galvanometer, c Spectrometer, D. thermometer, E.voltameter, The chromatographic separation of ink is based on the ability of the components to A. dissolve in each other B. move at diferent speeds, C. react with each other D. react with the solvent E. react with the stationary phase, The apparatus used! to bring about a steady rate of evaporation in salt solution is. A. bunsen bumer B. paper wedge C. sand bath D. tripod stand E. Wite guaze. During the electrolysis of molten lead bromide using carbon electrodes, A. bromine gas is given off a anode. B. bromine gas is given off at cathode C. carbon electrodes dissolve, D. hydroxide ion is dise ged at anode. E. lead is deposited at anode, Calculate the amount of copper (in moles) that will be deported by Tia 3 Faradays of electricity through a solution of copper (H) salt, A 60 B30 ce 20 De is E19 Scanned with CamScanner 42. 43, 44. 45. Which of the following statement is true of alkanes? They ‘A. are held together by electrovalent bond. B, _ are hydrocarbons. C. are more dense than air. D. are unsaturated. EB. havea general molecular formula CaHan. ‘The ion that will be least discharged in the electrochemical series is mOODD> = ae During flame test, what colour is observed when sodium ion is introduced to a non-luminous flame? A. Crimson B. — Golden-yellow Cc. Lilac D. __ Reddish-brown E. _Silvery-white Calculate the AH in Jmol" of a chemical system when the entropy is 212.2jk'mol"'at 100°C. * A. 79150.6 B. 40994.4 c 132082.9 D. 122082.9 B, — 2.1220 46. 47. 48. 4y. 50. In the periodic table, the position of an element is determined by its A, atomic number. B. density. C. ionization energy. D. __ melting and boiling points E. relative atomic mass. Which of these compounds account for temporary hardness of water? A. CaCO; B. — Ca(HCO3): Cc. Ca(OH) D. CaSO; EB CO, Calculate the number of atoms in 4g of carbon. [Avogadro's number = 6.02 x 10” particles per mole; A 15«108 B. 2.0«10" Cc 15x10? D. 2.010 BE 25x10" In the bleaching action of chlorine, oxochlorate (J) acid decomposes to release A. carbon, B. chlorine. C.__ hydrogen. D. nitrogen. FE. oxygen. Filtration method is used to separate immiscible liquids. uble solid from liquid. C. miscible liquids. Dp, __ soluble solid froma , solvents from its $0 Scanned with CamScanner Sl. Water treatment plants use the following processes except A. coagulation, B. disinfection, Cc distillation, D, filtration, EB sedimentation, 52. Which of the following belongs to the alkali metal family? A. Boron B, Calcium c. Chlorine D. Neon E Sodium 53, The oxidation Aumber of sulphur in 80; is A 4K Bo =. c aa De +3, E +4, 34. Calculate the Percentage by mass of ao een in calcium trioxocarbonate (lv). a 00-16, c= 13] A 8 B. 16 chad Di 32 Eds 5S. The Solubility of alkanols in water is due to A. its density, its low boiling points, C. its low freezing points, D. its volatile nature, E. the presence of hydroxyl group, SPK/I7/F 56, 57. 58, 59, In acid-base tations, averaging involves using all the final readings, all the initial readings, concordant readings, highest and lowest readings, initial and rough readings, r90mD> Anadvantage of detergents over soaps is that detergents are brightly coloured, are in powdered form, are non-biodegradable, are readily available, lather readily with water, moom> {he alloy “duralumin’ which is use in the manufacture of aeroplanes consists of Al, Ca, Al, Cu, Mn and Mg, Al, Mg, Mg, Ni, Co and Fe, Al, Ni, Co and Fe, MoOOR> The oxidation number of chlorine is +1 in A HCl. B. KIO. Cc. Nacl, D. Nacio. E ZaCh, Due to rusting the weight of ion A. decreases, Be doubles. Cc increases, D. reduces by half EB Temains the same, Scanned with CamScanner 1@ i) 7) (iv) ) @ Gi) (ii) © AO (i) (iii) 12 PAPER II Answer any four questions only. List two physical properties of water. (2 marks) Calculate the percentage by mass of sodium and oxygen jc in sodium tetraoxosulphate (VI). (Na= 23, $=32,0=16), (marks) ‘Name one metal that is extracted by electrolytic process. (1 mark) Give the ore of the metal named ina (iii). (1 mark) Given the electronic configuration of the elements represented by letters A, B, C, D and E respectively as: Is? 23? 2p? 1s? 2s? 2p* Is? 2s? 2p Is? 2s? 23s? As? 2s? 2p°33? 3p$ mPoOOmD> State which of them: (Belongs to group IV in the periodic table (I) Isans-block element (U1) Does not participate readily in chemical reaction (IV) _ Readily ionizes by gaining one electron (V) Contains two unpaired electrons in the ground state G marks) Define a standard solution. (2 marks) Give one difference between dilute and concentrated solution. (2 marks) Mention two classes of carbohydrate. (2 marks) Give the structural formula of the following: (— Methylbenzene (1) Propanone (I) 2,2,3—trimethyl pentane (3 marks) Give one chemical test for oxygen. (2 marks) TOTAL = 25 marks Scanned with CamScanner Define: (Oxidation in terms of electron transfer (1) Reduction in terms of electronegative and electropositive elements State two physical properties of nitrogen, What does X an ANH + COng—> Xy + Yu Copy and Complete the table below: iY represent in the equation below? (2 marks) (2 marks) (2 marks) (2 marks) Element | Mass Number Atomic Number [Number of Neutrons | Electronic Configuration | __35 17 18 —_— | Fluorine 19 10 1s'2s"2p GB marks) How many moles are there in 5g of sodium hydroxide? (Na=23,0=16,H=1] To isotopes of A with mass numb 1:2. Determine the relative atomic et 18 and 20 are in the ratio mass of A. (3 marks) (2 marks) State Faraday’s second law of, electrolysis, 2 marks) Daniel cell is represented by the following equation: 2046) / Zn a1 Cu! Cui) : From the equation above, what do the single and double lines represent? 2 marks) Define polymerization, 2 marks) Mention three uses of ethanol, 3 marks) TOTAL = 25 marks Scanned with CamScanner 3a) (©) 0) Gi) (iii) @ (ii) (ii) Gai) (iii) List three physical properties of metals. (3 marks) Arrange the following metals in order of increasing electropositivity : Ca, Zn, Au, Pb. (1 mark) Give one difference between strong and weak electrolytes. (2 marks) Explain with equation(s) the laboratory preparation of ethene from ethanol. (6 marks) Write two physical properties of ethene. (2 marks) In a reaction, 6.56g of zinc reacted with excess dilute hydrogen volved at s.t.p. ~ chloride acid. Calculate the volume of hydrogen ¢ [H= 1, Zn = 65.4, Cl = 35.5, volume of a gas at sp. = 22.4dm>], (4 marks) Enumerate two ethical practices that should be enforced in order to control pollution. (Q marks) Give one difference between an efflorescent, and a deliquescent substance. (2 marks) State three uses of sodium hydroxide. (3 marks) TOTAL =25 marks Scanned with CamScanner (bv) © @ i) (ii) (iv) ‘What are Peroxides? Give two examples of peroxides, Consider the soap molecule represented below: CHs (CHa)6 COO" Na’. Hydrophobie/hydrocarbon tail Hydrophilic head (1) Name the type of bond present in the hydrophilic head, (I mark) (11) Which partis responsible for its solubility in water? (1 mark) (IU) Explain why its leansing power is lowered in acidic water. (2 marks) What is meant by biodegradability of soap molecules? 2 marks) A student titrated 0.1 moldm? solution of tetraoxosulphate (VI) acid against 0.05 moldm’ solution of sodium hydroxide. @ i) (iv) @ G0 * Mention the indicator used. (mark) Give the name of the solution to which the indicator was added, (1 mark) Write a balanced equation for the reaction. (2 marks) Calculate the concentration of tetraoxosulphate (V1) ' acid in gdm”, [H = 1, $= 32,0 = 16, Na= 23] (4 marks) State Boyle's law. (2 marks) 50g of water were heated to boiling point at constant rate of 2.28KI per minute. After boiling for 10 minutes, the mass 4 ‘of water decreased to 40g. Calculate the heat of vapourization of water. (5 marks) TOTAL =25 marks Scanned with CamScanner 6a) (i) When an unknown solution A was added to sample B (a member of the halogen family), a dark blue colouration was formed. () Name solution A and sample B. e marks) (1) State one reason for the colouration. (mar » (11) Mention two uses of sample B. 2 marks) (ii) State Dalton’s law of partial pressure. (2 marks) (b) An organic compound on analysis yielded 4.08g carbon, 0.68g hydrogen and 5.46g of oxygen. * (Calculate the emperical formula of the compound. (3 marks) Gi) If the relative molecular mass of the compound is 60, calculate its molecular formula, [C= 12, H=1,0=16] (3 marks) © (Consider the diagram below. ENERGY (© What type of reaction is illustrated above? (1 mark) (IQ) State what a and b represent, (2 marks) Gi) Give the two main processes involved in the manufacture of nitrogen from air. (2 marks) Name the type of chemical bond which exists in nitrogen molecule . (1 mark) @ = (i) Give reason why fats have higher melting points than oils, (in (i) State three physical properties of chlorine. State why Zn** and Sc** are colourless, Scanned with CamScanner h question is followed by four options lettered A 10 D. Find the corvect “fn pencil on your answer sheet, the answer space whic bears the 276 ett Give only one answer to each question. An example is given below: Which of the following elements reacts with water? A. Carbon B. Iodine Cc. Sulphur D. — Sodium The correct answer is Sodium, which is lettered D, therefore answer space D would be shaded. tal [B} [Cc] lial (s) you wish fo change. Think carefully before you shade the answer spaces; erase completely any answe Do all rough work on this question paper. Now answer the following questions. s the 1. The periodic table is an arrangement of 4, Which of the following elements hi elements according to their highest ionization energy? A. oxidation number. ‘A. Calcium B. atomic number. , B. Chlorine CC. mass number. C. Fluorine D. number of neutrons. D. Magnesium 5. Thebleaching acti ine is throug! +. Asolid substance with high melting and a leaching action of chlorine is through ¢ process of boiling points is likely to be A. hydration. ‘A. acovalent compound. B. _ hydrolysis. B, _adative covalent compound C. reduction. CC. anelectrovalent compound. D. D. anon-metal. oxidation. 6. If6.5 gofmagnesium ribbon reacts completely with hydrochloric acid, how many grams of 3. Which of the following metals reacts slowly hydrogen gas would be liberated? with cold water? A. Iron MB yy + 2HClaq) —> MeChojag) * Hag) B. Silver [H= 1.0, Mg=24.0] Cc. Caleium A. 054g D. Potassium B. 070g Cc 108g D. 140g ida i ii at i Scanned with CamScanner 10. UL. 12. Calcium and magnesium belong to the same group of the periodic table because both A. are metals. B, form cations. C. form colourless sats. D. _ have same number of valence electrons. Which of the following substances is non-polar? A. Bry B. NH; Cc. H,0 D. HBr Which of the following pairs of components have the same molecular mass? [H= 1.0, C= 12.0. 0 = 16.0] Ethene and ethyne Ethane and ethene Carbon (II) oxide and ethene ‘Carbon (IV) oxide and ethyne pou> When an equilibrium is established between dissolved and undissolved solutes, the solutior is said to be A. saturated. B, unsaturated. C. concentrated. D. dilute. How many moles of carbon (IV) oxide contains 16.0 g of oxygen? [C= 12.0, 0= 16.0} A, 0.20mol B, 0.25 mol Cc. 0.40 mol D. 0.50 mol Stoichiometry is based on the law of ‘A. multiple proportion. constant composition. conservation of energy. B. cc D. conservation of mass. LE Saat id tte 1B. 14. 15. 16. 17. What isthe percentage by mass of hydrogen i CH,COOH? — [CH,COOH = 60) A 17% * B. 5.0% Cc 6.7% dD. 11% Which of the following compounds has coordinate bonds in its structure? A. ALC, B. MgCl c. AgCl D. NaCl ‘The name of the compound CH C(CH,),CH,CH,CH, is A. 2-methyl butane. B. 2, 2- dimethyl butane. C. 2-methyl pentane. D. 2,2-dimethyl pentane. ‘The properties of a good primary standard include the following exeept ‘A, high molecular mass. B. low molecular mass. C. high degree of purity. D, readily available. What is the solubility of a salt X at 25 °C if the saturated solution of the salt contains 0.28 g in 100 cnr of solution? 6.08] 0.05 mol dn # B. 0.10 mol dn? C.2,60 mol div D, 2.80 mol dn Scanned with CamScanner 18, 19, 2 23. Vinegar is an aqueous solution of A. hydrochloric acid, B. — ethanedioic acid. C. ethanoie acid D. _ hydroftuoric acid Which of the following solutions containing ‘one mole per div of the compound would have the lowest pif? A. Ethanoie acid B.Hydrochloris C. Sodium chloride D. Sodium iyctrogentrioxocarbonate (IV) A sample of air was bubbled into water, The pH of the water slowly changed from 7 t 6. Which of the following gases in the sample caused the change? A. Carbon (IV) oxide B. Carbon (II) oxide C. Nitrogen D. Oxygen ‘The most suitable indicator for the re between NaOH, and HCOOH. is A. bromocresol B. methyl orange. C. methyl red D. _ phenotphthatein Consider the following reaction equation: 2AN(OH), + 3HSO, — Alx(SO,); + 61,0, How many moles of tetraoxosulphate (V1) acid is needed to produce 0.5 mol of aluminium tetraoxosulphate (VI)? AL 0S B10 Cc. 1S D. 30 Which of the following pairs of substances has the highest heat of neutralization? A. Strong acid and strong base B. Weak acid and weak base C. Stror cid and weak base D. Weak acid and strong base 26. 28, 29, When quicklime dissolves in water, A. B. a b, Ifthe value of AH is positive for a te heat is absorbed. heat is evolved s liberated. gen is given off it means that the reaction is A B, a D. exothent endothermic spontaneous. Which of the following compounds is formed by the oxidation of ethanol? A CyH,CO,H CM.COnH chon CH;COH What isthe characteristic of the gas liberated when dilute hydrochloric a iron (Il) sulphide? A B. D. id is added to ‘Tums lime water milky Decolorizes bromine water Gives a pop sound ‘Tums lead (II) ethanoate paper black Anorganie compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass, What is the empirical formula of the compound? (H=1.0,C=120,0= 160) * AL CHO B. Ct,,0 C. Cgtty,0, D. Cy3Hy,0), When excess chlorine is mixed with ethane at room temperature, the product formed is A B. ol D. 1,2 dichloroethane, 1, 2- dichloroethene, 1, 1 - dichloroethane, 1, 1 -dichloroethene, Scanned with CamScanner 31. 32. 33. 3. Which of the following reagents could be used to distinguish between propan-I-ol and propan-2-ol? A. HY/K,Cr,0, B. 1,/OH™ Cc. CH,COOH D. NaCl Ifa catalyst is added to a system at equilibrium and the temperature and pressure remain constant, there would. .0. MTeet on the A. activation energy of the 1. in, rate of the forward reac . B. C. rate of the reverse reaction D. heat of reaction. Consider the following reaction equation: 3Cl, + 2NH; — Np + 6HCI NH, is acting as A. areducing agent. B. — adehydrating agent. C. adying agent. D. an oxidizing agent. The oxidation number of chromium in Cr, 0,7 is AU +4 * B. +5. Cc +6 D. +7. The process by which alkanoic acid reacts reversibly with alkanols is known as ‘A. saponification. poe halogenation. 35. 36. 37. 38. 39. If the oxidation potential of Mg and Al are +2.37 volts and + 1.66 volts respectively, then Mg would. ‘A. not replace Al. B. be replaced by Al, C. remain in the solution. b. replace Al. | Consider the reaction represented by the following equation: 28 —2 28Og¢gj* On¢g) = S03) ‘A decrease in pressure of the reaction would ‘A. decrease the concentration of SO, B, have no effect on the reaction. C. shift the equilibrium position to the lef. D. _ shifi he equilibrium position to the right. do not react In a mixture of gases w chemically together, the pressure of the individual gas is ‘A. atmospheric pressure, B. vapour pressure. C. total pressure. D. partial pressure. Biotechnology is applied in the ‘A. treatment of sewage. B. treatment of water. C. purification of chemicals. D. purification of metals. Which of the following organic compounds has the lowest boiling point? AL Calg B.C C. CyHig (CHy);CH Scanned with CamScanner 9% 10. What is the mass of silver deposited when 24,125 C of electricity is passed through a solution of silver salt? [Ag=108, 1F=96,500C] y A, 432g B. 108g c S4g D. 27g Equal masses of calcium trioxocarbonate (IV) were added to dilute hydrochloric acid at the temperature specified. Under which of the following conditions would the reaction be slowest? ‘A, Calcium trioxocarbonate (IV) chips at 20°C B. Calcium trioxocarbonate (IV) chips at 40°C C. Calcium trioxocarbonate (IV) powder at 20°C D. Calcium trioxocarbonate (IV) powder at 40°C The high solubility of ethanol in water is due to A. its low boiling point. B. its low freezing point. C. its covalent nature. D, _ hydrogen bonding. Which of the following metals reacts slowly with cold water? A. Calcium: B Silver C. Iron D. Potassium Which of the following pairs of properties of alkali metals decreases down the group? ‘A. First ionization energy and reactivity B. Melting point and atomic radius C. Reactivity and electronegativity D. _ First ionization energy and melting point 12. 13. 14. 15. 16. ‘The most suitable process of obtaining water 0 of sugar is from an aqueous sol A. crystallization, B, distillation. C. filtration D. decantation. Group VII clements in their combined states are called A. halogens. : B. anions. C. halides. D. cations. When an ionic bond is broken, bonding electrons are A. shared between participating atoms. B. gained by the most electropositive atom. C. gained by the most electronegative atom, D. lost by both participating atoms. The oxidation state of chlorine in NaClO, is AO 41 B43 CG 45 D. +6 * A balanced chemical equation is based on the law of A. periodicity. B. constant composition. C. multiple proportion. D. conservation of mass. Which of the following pairs of elements has the greatest difference in electronegativity? A. NaandF B, NaandCl C. NaandBr D. NaandI Scanned with CamScanner 17. 18, 19, 20, 21. 2. A factor that is considered most important when siting @ chemical industry is A. neamessto other industrial establishment. B. . neamess to raw materials. C. favourable climate conditions. D. availability of storage facilities, The boiling point of pentane is higher than that ‘of propane because ‘A. carbon-carbon single bonds are stronger than carbon-hydrogen bonds. B. pentane has more covalent bonds to ‘break. C. pentane does not bum easily as propane D. ‘he intermolecular forces in pentane are stronger than those of propane. ‘Which of the following solids would not decompose on heating? A. Ammonium chloride B. Lead (II) tioxonitrate (V) C. Potassium trioxocarbonate (IV) D. Sodium hydrogen trioxocarbonate (IV) The following molecules have double covalent bonds between two atoms except A. oxygen. B. carbon (IV) oxide. C. ethene, D. water. ‘The type of isomerism exhibited by cis and trans isomers is A. positional, B. geometrical. C. functional D. optical ‘Which of the following compounds has the lowest boiling point? AL Cyltiy B. CH,COoH CHO D. CH,OH 4 23, 24, 26. An alkanol containing 60% carbon by mass would have a molecular formula [H = 1.0,c=12, 6.0) A. CH;OH. ; * B. C)H,OH. C. CyH,OH. D. C,H,OH. Which of the following compounds would release hydrogen when reacted with sodium metal? 1. CH,CooH IL. CH,CH,OH Ill, CH,COOcH, A. Tonly B. [and I only C. Mand If only D. Land Ill only ‘Which of the following substances is not a reducing agent? A Cc B. CO © 0, D. oH, Which of the following statements is correct for areaction at equilibrium? A. Allreactions cease ‘to occur: B. The reaction has gone to completion C. The rates of the forward and backward reactions are equal D. ‘The amount of product equals the amount of reactants Scanned with CamScanner m1. bar of the following reactions are always 1, Neutralization Il, Decomposition III, Combustion A. Land IL only B, [and Ill only C. Hand If only D. I, Mand Ill Which of the following standard conditions is 28. not correct about energy changes? ‘A. Standard temperature is 298 K B, Standard pressure is 1 atm C. Concentration of solution must be 1 mol dav D. AH at 298 Kis the activation energy 29. 15.0 cnr? of 0.200 mol div? Na,CO; was diluted to 250 cm? solution, what would be the concentration of the resulting solution? ‘A. 0.004 mol dni, ¥ B. 0.020 mol dm> C. 0.200 mal dm® D. 0400 mol dir® 430, The initial volume and pressure of 8 given mass of gas is V and 3 P. What i its Pressure ifits wotame is inreased to 2V at constant temperature? A. 3P x B 2P 3 cease) pb. 2P 3 5 31. 32. 33. 34. 35. What volume of oxygen ats.tp isrequiredto ‘bum completely 7.5 dn of methane according 1 _to the following equation? CH yg + 20r¢9)-* Orgy * Hy AL 3.75 dm x B. 7.50dm? C. 15.0dm3 D. 30.0dn3 ‘When 250 cm of a saturated solution of CuSO, at 30°C was evaporated to dryness, 5.0 g of the salt was obtained. What is the solubility ofthe salt at 30°C? [Cus0, = 160] x, A. 0.031 B. 0.125 c. 0.640 D. 1.560 ‘The bond between NH and Hin NH,* is A. dative. B. covalent. C. hydrogen. D, _ electrovalent. Which of the following oxides has a giant covalent structure? A, ALO3 B. N20 Cc. Po D. Sid, oxides is not Which of te following hyd soluble in water? Scanned with CamScanner © 36. mo” 18. , P 37. rt » 38, 39. 6 40. ‘Which of the following statements about the Solubility of a salt is correct? A. Assalt whose solubility increases With temperature would not crystallize easily on cooling. B. _Asalt whose solubility is independent of temperature would normally 41. crystallize out on cooling. C. Crystallization would be efficient in Separating outa salt whose solubi increases considerably with temperature D. Solubility ofa solid does not affect its crystallization, 2. How many moles of 13S0, are there in 50 em} of 0.108 mol dn solution ofthe acid? AL S4x10 B. s4xigt sd sax 107 D. sax 103 43. 1£20 em’ of sodium hydroxide was neutralized by 20 em} 00.01 mol dny3 tetraoxosulphate(VI acid, what is the concentration ofthe solution? A 0.010 * B. 0.020 C o.100 D. 0.150 “Electrons always occupy the lowest empty energy level” isa statement of 44, A. Aufbau Principle. B. Hund’s rule, Pauli Exctusion Principe, D. Periodic taw, Which ofthe following metas does not re with water to pratuce hydrogen A. Lithium B. Potassium C. Sodium Zine of the following arrangement of elements is iy decreasing ordcr of electronegativity? A. Na, Mg. Al, Si, P B. Na, Al, Mg, P, Si C.PMg, Na, Si, Al D. PSi, AL, Mg, Na ‘The metallic bond in 1 vgnesium is stronger than ause magnesium has a A. larger atomic size, that in cal B. smaller atomic size, C. greater number of vatence electrons D. lower melting point, Consider the reaction repre: equation: nted by the following ABNO SG) + NAC ARC, + NO sag) ‘The sts that could be taken to obta pure dry sample Of ABCly from the mixture includes P heating to saturation and drying, &_Bitering and evaporation to drs 6, fine washing snd dying D. costallzing and allowing to cool, How many electrons does 13P containg ea A. 2 B. 15 Cc 16 Dis Scanned with CamScanner ize of the pipette must be ings (initial and final) as well as the size of eaters ric oo eapcennal prose is required. All calculations must be done on this question paper. Aisa solution containing 0.1 mol dm HCI B is a solution of Na;CO, obtained by taking 25 cm’ portion of saturated solution of NaxCO3 and making it up to 1000 cm”. Titrate A against 20 cm? or 25 cm? of B using methyl orange as an indicator. Repeat the titration three more times and record your results in the table below. : ‘The volume of pipette used . Titration Rough 1 2 3 Final burette reading | (em) Initial burette reading (om’) Volume of A used | (cm*) (6 marks) @ Calculate the average volume of A used {H=1,c1 5.5, Na=23,C= 12,0= 16) Scanned with CamScanner ii, Write the equation for the reaction between A and B. (@ marks) ) From the results and information provided, calculate the: i, Concentration of B in moldm”? ’ (4 marks) ii, Solubility of B in moldm™> (2 marks) YAL/18/H_ Scanned with CamScanner iii, Mass of NayCO5 that will be obtained by evaporating 1.0dm? of the saturated solution to dryness (4 marks) Total = 20 marks ‘YAL/18/H Scanned with CamScanner il 2, Candidates are advised to adhere strictly to the instructions gi i s structions given. All ‘observati ns and inferences must be recorded in the table low. Identify gas(es) given off. ‘You are provided with sample C. Carryout the following test on it. SIN. Test Observation Tnference C+ Sem? of distilled water and shake (a)i. ‘thoroughly. Divide the solution into two portions. (1 mark) (i mark) ji, | To the Ist portion, add BaCh; solution. (1. mark) (3 marks) iii | Add dilute HCI in excess to the product in (ai. = (1mark) (marks) (by. | To the 2nd portion, add few drops of dilute HCl. @ marks) (1 mark) si | To the product of (bi, add few drops of phenolphthalein indicator. (1. mark) (1 mark) } Total = 1Smarks. Scanned with CamScanner 3(@) i, Aqueous solutions of zinc chloride, ammonium trioxocarbonate (IV) and calcium trioxonitrate (V) are contained in three separate bottles which are mislabelled. Using NaOH solution only, how will you identify the content of each bottle? (B marks) ii, Mention one method each that can be used to ascertain the purity of a: 1 Liquid substance (1 mark) I Solid substance (1 mark) (&) i. State two differences between boiling and evaporation. (4 marks) YAL/18/H ji, State one reason why carbon (IV) oxide is used to extinguish fire. (1 mark) © i What is a molar solution? (2 marks) ii, ‘Name the substance used to identify the end point of a titration. (1 mark) iii, List two examples of the substance mentioned in (c)ii. (2 marks) Total = 15 marks YAU18/H Scanned with CamScanner

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