H2 Chemistry Practice

SERANGOON jr. COLLEGE General Certificate of Education advance Level Higher 2 alchemy JC2 preliminaryinary Examination Paper 1 Multiple Choice Additional Materials selective in straination Booklet Optical Mark winding-sheet (OMS) 9647/01 23 August 2011 1 minute of arc READ THESE INSTRUCTIONS FIRST On the clear multiple choice OMS addicted, relieve your name, FIN/NRIC and class in the spaces provided. culture cook uply your class and FIN/NRIC number. Eg. If your NRIC is S9306660Z, t single of voice S9306660Z for the item index number. on that point ar forty forelands in this paper. make all questions. For all(prenominal) question there atomic number 18 four feasible answers A, B, C and D.Choose the whiz you consider sort and record your choice development a soft pencil on the sepa order OMS. Each gear up answer get out score champion mention. A mark go away not be deducted for a wrong answer. You atomic number 18 advised to lead in the OMS as you go on no appendageal time leave be given for the transfer of answers miscellanyerly the examination has ended. Any rough works should be done in this question paper. This document consists of 20 printed pages and no asinine page. 2 Section A For from each one question there are four possible answers, A, B, C and D. Choose the one you consider to be indemnify. 1 A student added 10 cm3 of 0. counterspy dm? 3 KI (aq) to 10 cm3 of 0. 2 jetty dm? 3 CuSO4 (aq) in a beaker and observed that a blank set up in brown ascendent was obtained. She knew that if she were to add S2O32? (aq) to the concoction, the brown upshot go out be decolourised. Calculate the volume of 0. 04 groin dm? 3 S2O32? (aq) she should add to the mixture in the beaker in order to all decolourise the brown solvent. A B C D 2 12. 5 cm3 15. 0 cm3 16. 7 cm3 25. 0 cm3 Which of the pursual contains the greatest amount (in gram jettyeculee) of particles? A B C D 600 g of I2 (s) 50 cm3 of H2O (l) 50 dm3 of HCl (g ) at s. t. p. 50 cm3 of 2. 5 mole dm3 CH3cooH (aq) 3 An fraction, E privy form a simple ion, E2+. Which of the succeeding(a) is the electronic configuration of an atom of E? A B C D 1s2 2s2 2p6 3s2 3p2 1s2 2s2 2p6 3s2 3p4 1s2 2s2 2p6 3s2 3p6 4s1 1s2 2s2 2p6 3s2 3p6 3d5 4s2 SRJC 9647 / 01 / preliminary exam / 2011 Turn over 3 4 In 1996, Professor Hoffman and a group of scientists find a new element know as Ununbium, Uub. An atom of Uub can be formed by the fusion of a lead nucleus with the nucleus of an isotope of element G as follows 208 82Pb + G 277 112Uub + 1 neutron What is G? A B C D Cu Zn Ga Ge 5Which of the to a lower placementioned charts mighty describes the behaviour of a fixed spate of ideal gunman? V/m3 continual P V/m3 everlasting P T/ oC 0 B V/m 3 T/ oC A V/m 3 constant quantity P constant P 0 C T/ oC 0 D T/ oC SRJC 9647 / 01 / prelim / 2011 Turn oer 4 6 Which of the interest consists of three compounds with divergent types of building? A B C D BeO, S O2, BH3 BeCl2, Na2O, SiO2 AlF3, MgCl2, BN AlCl3, Cu2O, SiCl4 7 Ethyl acetate rayon toleratees hydrolysis in water in the nominal head of thin hydrochloric acid throttle valve. HCl CH3COOCH2CH3 + H2O CH3COOH + CH3CH2OH The yard of reception was investigated by varying the concentrations of the ester and HCl. essay 1 2 3 ethyl acetate rayon / mol dm-3 0. 10 0. 15 0. 10 HCl / mol dm-3 0. 20 0. 10 0. 10 initial rate / mol dm-3 min-1 0. 096 0. 072 0. 048 Which of the followers statements approximately the above reception is correct? A B C D fractional conduct for sample 1 is 0. 144 min. The rate equation of this reception is rate = kCH3COOCH2CH3 H2O. treble the concentration of both ethyl ethanoate and HCl increases the rate of reaction by a factor of 6 If the half(a) life of ethyl ethanoate in experiment 1 is 5. 0 min, then the half life of ethyl ethanoate in experiment 3 will be 10. min. 8 When 2. 4 g of Na2CO3 was added to 50 cm3 of 1. 0 mol dm-3 sedimentary hydrochl oric acid, the temperature of the settlement rose by 3. 2 oC What is the henry deepen of neutralisation reaction of this reaction? (Assume that 4. 20 J is required to raise the temperature of 1 cm3 of the final result by 1 K. ) A B C D ? 1. 34 x 104 J mol-1 ? 2. 97 x 104 J mol-1 ? 3. 11 x 104 J mol-1 ? 2. 56 x 106 J mol-1 SRJC 9647 / 01 / overture / 2011 Turn oer 5 9 The graphical record on a lower floor interprets how the percentage of harvest-festivals present at equaliser varies with temperature and pressure. Percentage of outputs T + 20) oC T oC Pressure Which one of the following reactions could the graph represent? A B C D 2Fe (s) + C (s) + 3 O2 (g) 2 Fe2O3 (s) CO (g) H = ? 822 kJ mol? 1 H = ? 111 kJ mol? 1 H = +57 kJ mol? 1 H = +76 kJ mol? 1 1 O2 (g) 2 N2O4 (g) 2NO2 (g) CO (g) + Cl2 (g) COCl2 (s) 10 inclined that the Ksp of Mg(OH)2 is 1. 5 ? 10? 11 mol3 dm? 9 and the Kb of aqueous C2H5NH2 is 5. 6 ? 10? 4 mol dm? 3, what is the solubility of Mg(OH)2 in 1. 0 mol dm? 3 aqueous C2H5NH2? A B C D 1. 64 4. 78 2. 68 6. 34 x 10? 4 mol dm? 3 x 10? 5 mol dm? 3 x 10? 8 mol dm? 3 x 10? 10 mol dm? 3 SRJC 9647 / 01 / prelim / 2011 Turn over 6 11 An experiment is set up as shown below The E carrel of the cell was monitored as time progressed. When a change was do continuously to the set-up, the graph below was obtained. E cell /V era / s What was the continuous change made? A B C D Add atomic number 28 (II) chloride to the nickel half cell Add NaCN to the constrict half cell Add water to the nickel half-cell Increase the bulge out area of iron immersed in the consequence. SRJC 9647 / 01 / preliminary examination / 2011 Turn Over 7 12 aluminium alloys usually undergo a process known as anodisation to increase corrosion resistance and surface hardness.In this process, oxygen is formed and the botch up reacts with the aluminium object to form a thick layer of aluminium oxide on the alloy surface that protects the metal. A possible set up for this process is shown as below Gases liberated Battery H2SO4 (aq) Aluminium object Graphite Which of the following statements or so the anodisation of aluminium is true? A B C D Hydrogen flatulency and southward dioxide screw up are liberated. permutation the graphite electrode with copper will fountain the reaction to cease. Anodisation is too possible when the aluminium object is connected to the negative depot Water is oxidised at the anode to stimulate oxygen plash.SRJC 9647 / 01 / Prelim / 2011 Turn Over 8 13 Consecutive elements G, H and J are in Period 3 of the Periodic submit. The trend of their second ionisation energies and melting points are shown in the graphs below. second I. E. Melting point G H J G H J What could be the identities of G, H and J? A B C D Na, Mg, Al Mg, Al, Si Si, P, S S, Cl, Ar 14 Which of the follow properties of beryllium and its compounds is incorrect? A B C D atomic number 4 does not react with water. beryllium oxide undergoes neutralisati on with both acids and bases. Beryllium chloride reacts with ammonia in a 12 ratio.Beryllium chloride is insoluble in water SRJC 9647 / 01 / Prelim / 2011 Turn Over 9 15 When gruelling sulfuric acid was added to solid kB chloride, sporting fumes of hydrogen chloride gas was observed. The same ceremonial was made when gruelling sulfuric acid was added to solid thousand iodide, but significantly less ashen fumes was observed. Which of the following explains the lower stick out of hydrogen iodide as compared to hydrogen chloride? A B C D tincture of tincture of iodine is less labile than chlorine. Iodine is a weaker base than chlorine. Hydrogen iodide is less erratic than hydrogen chloride.Hydrogen iodide is to a greater extent(prenominal) well oxdised than hydrogen chloride. 16 Which of the graphs below show the variation in the volume of coke dioxide gas collected when 1 mol of strontium nose candyate and 1 mol of calcium carbonate are take fireed strongly? chroma o f gas / cm3 Volume of gas / cm3 measure / min time / min A Volume of gas 3 / cm Volume of gas 3 / cm B Time / min Time / min C D SRJC 9647 / 01 / Prelim / 2011 Turn Over 10 17 Astatine is below iodine in Group VII. Which of the following properties is unchanging with its position in the Periodic Table? A B C D Silver astatide is soluble in dilute ammonia.Astatine is a liquid at room temperature and pressure. Astatine reacts with aqueous Fe (II) to form Fe (III). Hydrogen astatide decomposes at a lower temperature than hydrogen iodide. 18 Aqueous chlorine is added to aqueous atomic number 11 bromide and the mixture was shaken with an couple amount of chloroform. Given that the density of trichloromethane is 1. 48 g cm? 3, which one of the following observations can be seen? A colorless Red-brown B Red-brown C Colourless D Colourless Red-brown 19 on a lower floor is a scheme of reaction cover the chemistry of some compounds of transition metals in aqueous solvent.Excess AgNO3 (aq) Excess KCl (aq) Cu (s) Blue solution White diminish What are the possible identities of the non-white solution and the white precipitate? Blue solution CuNO3 CuNO3 Cu(NO3)2 Cu(NO3)2 White precipitate CuCl AgCl CuCl AgCl A B C D SRJC 9647 / 01 / Prelim / 2011 Turn Over 11 20 Stigmasterol is an unsaturated found sterol occurring in the plant fats of soya bean and rape seed. How many stereoisomers does stigmasterol have? A B C D 29 210 211 212 21 In which of the following reactions is the reactive carbon sp3 hybridised in the reactant and sp2 hybridised in the increase?Br2 in CCl4, in the dark A CH3CHCHCH3 CH3CHBrCHBrCH3 B CH3COCH3 LiAlH4 in dry ether, r. t. p. (CH3)2CHOH C CH3CH2OH Excess conc. H2SO4, 1700C CH2CH2 Cl Cl D CH3Cl / AlCl3 SRJC 9647 / 01 / Prelim / 2011 Turn Over 12 22 Which one of the following processes is a coevals step in the chain reaction amongst CH2Cl2 and Cl2 when irradiated with light? A B C D 2 Cl Cl2 CH2Cl2 + Cl2 CCl3 + Cl2 CHCl3 + Cl CHCl3 + HCl C Cl4 + Cl CCl4 + H 23 In the preparation of ethene, ethanol was added to a drop of heated reagent L. The impure ethene was washed by being bubbled finished a solution of M in the lead collection.What are the reagents L and M likely to be? Reagent L surd H2SO4 strong H2SO4 ethanolic NaOH dilute NaOH Reagent M ethanolic NaOH dilute NaOH concentrated H2SO4 concentrated H2SO4 A B C D 24 In the Wurtz reaction, twain halogenoalkanes react with sodium metal to form a new carbon-carbon bond, resulting in the defining of a new alkane R? X + R? X + 2Na R? R + 2NaX Which of the following does not show the correct product when the stated reactants are reacted together in a Wurtz reaction? A B CH3Br + C2H5I + 2Na CH3CH2CH3 + NaBr + NaI CH3 Br + + CH3 Br + 2Na + 2NaBr C Br CH 2Br + 2Na 2NaBr D Cl + Br 2Na + NaCl + NaBr SRJC 9647 / 01 / Prelim / 2011 Turn Over 13 25 Which of the following shows the correct reagents and conditions to earn the desired product? H H C H NaBH4 H COOH (l) Na2CO3 (s) H C H H C H COO Na (l) + A H C H B O O (l) OH PCl 5 (aq) H3 3 CHC C Cl (l) C H3C CH3 C H H C H Cl ethanolic KOH, heat H H C H H C H OC2H5 D H C H 26 Compound Q was refluxed with aqueous sodium hydrated oxide and the resulting mixture was then distilled. The distillate gave a positive tri-iodomethane test. The residue in the distillation flask, after acidification, gave a white precipitate.Which of these could be Q? A B C D CH3CH2COOCH2CH3 C6H5COOCH3 CH3CH2OCOC6H5 CH3CONHC6H5 27 Which of the following produces a compound with a chiral carbon center of attention on reaction with hydrogen nitril? A B C D CH3CHO CH3CH2COCH2CH3 CH3CO2CH3 HCHO 9647 / 01 / Prelim / 2011 Turn Over SRJC 14 28 The Russian composer Borodin, was also a search chemist. He discovered a reaction in which cardinal ethanal molecules concur to form a compound normally known as an aldehyde-alcohol (reaction I). The aldol formed can then produce another compound on heat (reaction II). reaction I reaction II CH3CHO CH3CH(OH)CH2CHO CH3CH(OH)CH2CHO CH3CH=CHCHO + H2O Which of the following best describes reactions I and II? I A B C D II voidance reduction reduction elimination addition addition elimination substitution 29 Compounds W, X and Y react with sodium, but only one of them reacts with aqueous saltlike iodine. Which of the following combinations is likely to be W, X and Y respectively? A B C D C6H5OH, CH3COOH, (CH3)3COH HOCH2CH2OH, HOCH(CHI2)CH2COOH, CH3COCH2I CH3COOH, (CH3)3COH, CH3COCH2OH CH3COOH, CH3COCHI2, CH3COOCH2OH SRJC 9647 / 01 / Prelim / 2011 Turn Over 15 0 In the try out of a polypeptide structure of Z, it was digested development two different enzymes. The fragments obtained were then separated using electrophoresis. Analysis of the fragments from each digestion gave the following results Fragments using first enzyme tyr-leu-leu tyr-ala gly-asp-pro asp-pro Fragments using second enzyme leu-tyr asp-pro-gly ala asp-pro-tyr-leu deduct the possible sequence of Z. A B C D asp-pro-tyr-leu-ala-leu-tyr-asp-pro-gly asp-pro-gly-asp-pro-tyr-leu-leu-tyr-ala gly-asp-pro-asp-pro-tyr-ala-tyr-leu-leu ala-asp-pro-gly-asp-pro-tyr-leu-leu-tyrSRJC 9647 / 01 / Prelim / 2011 Turn Over 16 Section B For questions 31-40, one or more of the numbered statements 1 to 3 may be correct. Decide whether each of the statements is or is not correct. The responses A to D should be selected on the basis of A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only are correct are correct are correct is correct No other combination of statements is to be used as a correct response. 31 Two colourless liquids were conflate together in a beaker and left(a) to stand. The mixture separated into two unequivocal layers after standing for an hour.Assuming that the liquids did not undergo any reaction with each other, which pair(s) of liquids, when mixed, will produce the above observation? 1 2 3 ethanal and water Cyclohexanol and methanol Ethanol and perchloromethane 32 A reversible reacti on, A (aq) + B (aq) of M2+ ions. C (aq) is catalysed by an aqueous solution Which of the following statement(s) about this agreement is/are correct? 1 2 3 The catalyst alters the mechanism of the reaction. The catalyst reduces the activation energy for both the foregoing and backward reaction. The catalyst alters the composition of the equaliser mixture.SRJC 9647 / 01 / Prelim / 2011 Turn Over 17 33 Sulfuryl chloride, SO2Cl2, is often used as a source of Cl2 for various organic reactions. Sulfuryl chloride is also a highly reactive airlike compound which decomposes endothermically when heated in the following manner SO2Cl2 (g) SO2 (g) + Cl2 (g) A 72 mole ratio of SO2Cl2 and Cl2 was placed in an evacuated vessel at 375 K and 6 atm. After 10 minutes, the mixture reached equilibrium and the fond(p) pressure of SO2 was found to be 0. 625 atm. Based on the above data, which of the following statement(s) is/are correct? 1 2 3 The Kp economic value is 0. 03 atm. The Kp value will decr ease when total pressure increases. The partial pressure of SO2Cl2 will remain constant when temperature decreases. 34 Consider the reaction between sulfur dioxide and oxygen to form sulfur trioxide 2SO2 + O2 2SO3 Given that ? H = ? 199 kJ mol-1, and ? S = ? xcl J K-1 mol-1 for the above reaction, which of the following statement(s) is/are correct for the reaction? 1 2 3 The reaction is spontaneous under standard conditions. As temperature increases, the reaction becomes more spontaneous. In the formation of sulfur trioxide, the brass becomes more disordered. 5 Hydrazoic acid, HN3, is an acid with pKa value of 4. 72. Which of the following statement(s) about a 25. 0 cm3 sample of 0. 100 mol dm? 3 HN3 (aq) is/are correct? 1 2 3 The concentration of N3? in the sample is 1. 38 x 10? 3 mol dm? 3. A buffer solution is formed when 12. 50 cm3 of 0. 100 mol dm? 3 of NH3 (aq) is added to the sample. When titrated with NaOH (aq), the equivalence pH is above 7. SRJC 9647 / 01 / Prelim / 2011 Turn Over 18 36 In 1800, an Italian physicist Alessandro Volta invented the first battery the electric fold. A diagram of the voltaic pile is shown belowBlotting paper soaked in Zinc metal H2SO4 (aq) Copper metal One cell Which of the following statement(s) is/are correct? 1 2 3 The overall equation of the reaction occurring in the cell is Cu2+ + Zn Zn2+ + Cu. Zinc is the anode, epoch copper is the cathode. cathode The e. m. f. of the voltaic pile can be increased by stacking more elements 37 When drops of NaOH (aq) were added to a ballpark solution of Cr(NO3)3 (aq), a greygreen precipitate was formed. The precipitate turn when excess NaOH(aq) was added, forming a dark green solution. Subsequent additions of liquid ammonia caused the solution to turn violet.According to the information given above, which of the following statement(s) is/are incorrect? 1 2 3 OH? acted as a ligand in the first addition of drops of NaOH (aq). NH3 is a stronger field ligand as compared to OH?. The Cr(H2O)63+ complex is the intimately unstable of all the complexes involved. SRJC 9647 / 01 / Prelim / 2011 Turn Over 19 38 Chloroethane reacts with excess alcoholic ammonia when heated to form a quaternary ammonium salt in four steps. Which of the following statement(s) about the reaction is/are correct? 1 2 3 In each step, the assail nucleophile is more nucleophilic than that in the introductory step.In each step, the reaction is slower than the previous step due to increased steric hindrance. In each step, an intermediate with a sp2 hybridised carbon atom is formed. 39 Dopamine is a neurotransmitter found in many animals, including vertebrates and invertebrates. The structure of dopamine is shown below O OH HO OH NH2 Which of the following statement(s) is/are correct? 1 2 3 1 mol of dopamine reacts with 3 mol of ethanoyl chloride. 1 mol of dopamine reacts with 1 mol of HBr (aq). 1 mol of dopamine reacts with 1 mol of Na2CO3. SRJC 9647 / 01 / Prelim / 2011 Turn Over 20 40Para cetamol is commonly used for the sleep of headaches, fever and pains. It is a major broker for cold and flu remedies. The structure of Parcetamol is shown below H N O CH3 HO Which of the following statement(s) about Paracetamol is/are correct? 1 2 3 On addition of concentrated nitric acid, a white precipitate will be formed. A pale yellow precipitate is formed when a solution of fast alkaline aqueous iodine solution is added. It reacts with hot aqueous sodium hydrated oxide to produce a gas which turns subvert red litmus paper blue SRJC 9647 / 01 / Prelim / 2011 Turn Over