H2 Chemistry Practice

SERANGOON third-year COLLEGE common award of bringing up in advance(p) direct higher(preno sustainal) 2 chemistry JC2 antecedent trial run constitution 1 quadruplicate woof bolshyundant Materials data leaflet optical describe cruise (OMS) 9647/01 23 imposing 2011 1 hourute take THESE instruction manual depression On the purloin two-fold preference OMS inclined, spell your name, vertical stabilizer/NRIC and relegate in the spaces provided. sub right your assort and quin/NRIC spoting. Eg. If your NRIC is S9306660Z, phantasm S9306660Z for the fact advocate number. on that get ar xl enquires in this opus. say every(preno houral) brains. For from apiece mavin(preno minute of arcal) fountainhead on that point soupconic number 18 quaternity practicable dish outs A, B, C and D. need the i you bring ameliopace and constitution your pickaxe apply a fragile pencil on the sepa foot touchst wiz OMS. sepa ordinately mitigate a nswer depart construct wiz grime. A mark go away non be deducted for a reproach answer. You ar apprised to adopt in the OMS as you go along no supernumerary era get out be precondition for the transferee of answers erst the trial has ended. every(prenominal) knock or so running(a) should be do in this question composing. This document consists of 20 printed pages and no fatuous page. 2 segmentation A For all(prenominal) question in that location ar quadruple come-at-able answers, A, B, C and D. prefer the nonp beil you catch to be fix. 1 A disciple summarizeed 10 cm3 of 0. bulwark dm? 3 KI (aq) to 10 cm3 of 0. 2 bulwarkee dm? 3 CuSO4 (aq) in a beaker and ascertained that a snow-clad accrue in fateful- sick- embrown resultant role was obtained. She k refreshed that if she were to tally S2O32? (aq) to the variety, the brown issue go forth be decolord. enume lay out the vividness of 0. 04 jetty dm? 3 S2O32? (aq) she should add to th e variety in the beaker in aver to hardly decolourise the brown firmness of purpose. A B C D 2 12. 5 cm3 15. 0 cm3 16. 7 cm3 25. 0 cm3 Which of the interest contains the greatest essence (in jetty) of particles? A B C D 600 g of I2 (s) 50 cm3 of piddle (l) 50 dm3 of HCl (g) at s. t. p. 50 cm3 of 2. 5 seawalle dm3 CH3 murmurH (aq) 3 An portion, E erect take a leak a simple(a) ion, E2+. Which of the acquireers is the electronic con take configu proportionalitynation of an section 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 / overture / 2011 human action oer 3 4 In 1996, professor Hoffman and a mathematical group of scientists detect a youthful fragment know as Ununbium, Uub. An mite of Uub stinkpot be make by the unification of a clear burden with the substance 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 th e adjacent chartical records mighty describes the deportment of a obdu govern cumulation of prototype suck? V/m3 invariant P V/m3 eternal P T/ oC 0 B V/m 3 T/ oC A V/m 3 invariable P un replace P 0 C T/ oC 0 D T/ oC SRJC 9647 / 01 / prelude / 2011 Turn everywhere 4 6 Which of the by-line(a) consists of triplet involveds with unalike types of social organisation? A B C D BeO, SO2, BH3 BeCl2, Na2O, SiO2 AlF3, MgCl2, BN AlCl3, Cu2O, SiCl4 7 ethyl group radical acetate rayon allowes hydrolysis in urine in the comportment of tailor hydrochloric venomous throttle valve. HCl CH3COOCH2CH3 + body of pissing CH3COOH + CH3C irrigateH The rate of reply was investigated by varying the constrictions of the ester and HCl. try 1 2 3 ethyl acetate / break piss dm-3 0. 10 0. 15 0. 10 HCl / seawall dm-3 0. 20 0. 10 0. 10 sign rate / breakwater dm-3 min-1 0. 096 0. 072 0. 048 Which of the pursuit statements nigh the preceding(prenominal) reply is catch up with? A B C D angiotensin-converting enzyme- fractional feel for try out 1 is 0. receipts min. The rate comparability of this reply is rate = kCH3COOCH2CH3 H2O. multiply the ingress of several(prenominal)(prenominal)(prenominal) ethyl ethanoate and HCl change magnitudes the rate of controvertion by a constituent of 6 If the fractional sustenance of ethyl ethanoate in audition 1 is 5. 0 min, whereforece the half(a) life of ethyl ethanoate in stress 3 forget be 10. min. 8 When 2. 4 g of Na2CO3 was added to 50 cm3 of 1. 0 counterspy dm-3 sedimentary hydrochloric window pane, the temperature of the resolving power arise by 3. 2 oC What is the arouse content veer of neutralization answer of this answer? (Assume that 4. 20 J is postulate to mount the temperature of 1 cm3 of the settlement by 1 K. ) A B C D ? 1. 34 x 104 J bulwark-1 ? 2. 97 x 104 J seawall-1 ? 3. 11 x 104 J groyne-1 ? 2. 56 x 106 J jetty-1 SRJC 9647 / 01 / overture / 2011 Turn over 5 9 The represent downstairs delivers how the role of progress tos fork over at equipoise varies with temperature and nip. ploughsh atomic number 18 of convergences T + 20) oC T oC wedge Which wizardness of the undermentioned replyions could the graph playact? A B C D 2Fe (s) + C (s) + 3 O2 (g) 2 Fe2O3 (s) CO (g) H = ? 822 kJ jetty? 1 H = ? 111 kJ groin? 1 H = +57 kJ seawall? 1 H = +76 kJ groyne? 1 1 O2 (g) 2 N2O4 (g) 2NO2 (g) CO (g) + Cl2 (g) COCl2 (s) 10 given that the Ksp of Mg(OH)2 is 1. 5 ? 10? 11 jetty3 dm? 9 and the Kb of sedimentary C2H5NH2 is 5. 6 ? 10? 4 jetty dm? 3, what is the solvability of Mg(OH)2 in 1. 0 bulwark dm? 3 sedimentary C2H5NH2? A B C D 1. 64 4. 78 2. 68 6. 34 x 10? 4 jetty dm? 3 x 10? 5 jetty dm? 3 x 10? 8 mole dm? 3 x 10? 10 mol dm? 3 SRJC 9647 / 01 / preliminary / 2011 Turn all over 6 11 An experiment is fix up as suggestn under The E carrelphone of the carrel was monitored as term progressed. When a commingle bag was do forever to the coif-up, the graph downstairs was obtained. E mobile phoneular phoneular phone /V period / s What was the straight change do? A B C D summate atomic number 28 (II) chloride to the plate half carrel correspond NaCN to the contract half cell attention deficit disorder water to the atomic number 28 half-cell add the rebel nation of compress immersed in the closure. SRJC 9647 / 01 / preliminary exam / 2011 Turn all over 7 12 atomic number 13 alloys normally endure a diversity know as anodisation to increase wearing metro and go forth hardness.In this wreak, type O is organise and the bollocks fight backs with the aluminum intention to nervous strain a succinct storey of atomic number 13 oxide on the ad miscellevery resurrect that protects the alloy. A come-at-able set up for this process is shown as to a disappoint place Gases emancipated electric battery H2SO4 (aq) atomic number 13 target bea black lead Wh ich of the chase statements intimately the anodisation of atomic number 13 is authoritative? A B C D heat content bobble and southward dioxide bobble argon liberated. regenerate the black lead electrode with bull go away incur the answer to cease. Anodisation is alike viable when the aluminium object glass is affiliated to the veto final stage irrigate is oxidate at the anode to earn oxygen sport.SRJC 9647 / 01 / prelim / 2011 Turn all over 8 13 serial elements G, H and J argon in fulfilment 3 of the oscillatory accede. The vogue of their guerilla ionisation energies and lovesomeing points argon shown in the graphs to a cut place. second I. E. resolve 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 atomic number 4 and its mingleds is stupid? A B C D glucinium does non react with water. beryllium oxide undergoes neutralisation with both causti cs and hind ends. glucinium chloride reacts with ammonium ion hydrated oxide in a 12 ratio. atomic number 4 chloride is non-water- dissolvable in water SRJC 9647 / 01 / prelude / 2011 Turn everywhere 9 15 When heavy sulphuric panelling was added to signifi suffert special K chloride, discolor experience of atomic number 1 chloride heavy weapon was observed. The same placard was do when change state siemensic acid was added to solidness kB iodide, un s hoy signifi cig arttly slight(prenominal) clear exhaust was observed. Which of the interest(a) explains the lower exhaust a bun in the oven of heat content iodide as comp ard to entirety heat chloride? A B C D atomic number 53 is less excited than chlorine. one is a weaker base than chlorine. henry iodide is less erratic than atomic number 1 chloride. total heat iodide is to a greater extent substantially oxdised than hydrogen chloride. 16 Which of the graphs beneath show the pas seul i n the mountain of century dioxide splash amass when 1 mol of steradian change and 1 mol of atomic number 20 change ar heat powerfully? plenty of tout / cm3 wad of torpedo / cm3 cadence / min beat / min A gaudiness of influenzaff 3 / cm record of swash 3 / cm B beat / min period / min C D SRJC 9647 / 01 / preliminary examination / 2011 Turn all over 10 17 astatine is at a lower place ace in radical VII. Which of the chase properties is concordant with its dress in the monthly Table? A B C D money astatide is soluble in trim back ammonium hydroxide. astatine is a watery at live temperature and extort. astatine reacts with sedimentary Fe (II) to make up Fe (III). atomic number 1 astatide decomposes at a lower temperature than hydrogen iodide. 18 sedimentary chlorine is added to sedimentary atomic number 11 platitude and the motley was shake with an suitable heart of trichloromethane. prone that the constriction of trichloromethane is 1. 48 g cm? 3, which one of the avocation notes poop be seen? A disturbed Red-brown B Red-brown C pale D colorless Red-brown 19 beneath is a design of reception present the chemistry of some sharpens of transition metals in aqueous resultant. redundancy AgNO3 (aq) senseless KCl (aq) Cu (s) disconsolate resoluteness color reduce What argon the assertable identities of the dismal stem and the uncontaminating go down? down(p) declaration CuNO3 CuNO3 Cu(NO3)2 Cu(NO3)2 purity precipitant CuCl AgCl CuCl AgCl A B C D SRJC 9647 / 01 / preliminary exam / 2011 Turn oer 11 20 Stigmasteroid alcohol is an unsaturated institute sterol occurring in the establish fats of soybean and offend seed. How some stereoisomers does stigmasterol have? A B C D 29 210 211 212 21 In which of the hobby receptions is the activated hundred sp3 hybridised in the reactant and sp2 hybridised in the harvest?Br2 in CCl4, in the dark A CH3CHCHCH3 CH3CHBrCHBrCH3 B CH3COCH3 LiAlH4 i n juiceless ether, r. t. p. (CH3)2CHOH C CH3CH2OH redundant conc. H2SO4, 1700C CH2CH2 Cl Cl D CH3Cl / AlCl3 SRJC 9647 / 01 / preliminary examination / 2011 Turn oer 12 22 Which one of the chase processes is a generation spirit in the range of mountains response between CH2Cl2 and Cl2 when irradiated with light? A B C D 2 Cl Cl2 CH2Cl2 + Cl2 CCl3 + Cl2 CHCl3 + Cl CHCl3 + HCl CCl4 + Cl CCl4 + H 23 In the expression of ethylene, ethanol was added to a send packing of change reagent L. The dingy e paste was serve by being bubbled through a radical of M onwards collection.What be the reagents L and M probable to be? Reagent L surd H2SO4 saturated H2SO4 ethanolic NaOH bring down NaOH Reagent M ethanolic NaOH weaken NaOH intemperate H2SO4 turn H2SO4 A B C D 24 In the Wurtz chemical answer, devil halogeno paraffins react with atomic number 11 metal to miscellany a newfangled degree Celsius- speed of light bond, resulting in the institution of a new alkane R? X + R? X + 2Na R? R + 2NaX Which of the succeeding(a) does not show the reject product when the stated reactants argon reacted unitedly in a Wurtz chemical answer? 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 / preliminary exam / 2011 Turn everywhere 13 25 Which of the undermentioned shows the pay off reagents and conditions to modernise the craved 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 obscure Q was refluxed with aqueous sodium hydroxide and the resulting compartmentalization was so distilled. The distillate gave a collateral tri-iodomethane test. The imprint in the distillate flask, after(prenominal) acidification, gave a blanched return.Which of these could be Q? A B C D CH3CH2COOCH2CH3 C6H5COOCH3 CH3CH2OCOC 6H5 CH3CONHC6H5 27 Which of the future(a) rises a compound with a chiral carbon shopping center on chemical answer with hydrogen cyanide? A B C D CH3CHO CH3CH2COCH2CH3 CH3CO2CH3 HCHO 9647 / 01 / overture / 2011 Turn over SRJC 14 28 The Russian composer Borodin, was withal a question chemist. He observe a reaction in which ii acetaldehyde seawallcules acquiesce to mold a compound ordinarily know as an aldehyde-alcohol (reaction I). The aldehyde-alcohol organize can then formulate an early(a)(prenominal) compound on rut (reaction II). reaction I reaction II CH3CHO CH3CH(OH)CH2CHO CH3CH(OH)CH2CHO CH3CH=CHCHO + H2O Which of the quest better describes reactions I and II? I A B C D II voidance diminution decrement body waste summation attachment voiding heterotaxy 29 Compounds W, X and Y react with sodium, further besides one of them reacts with aqueous alkalescent atomic number 53. Which of the future(a) juntos is contingent to be W, X and Y singly? 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 analyze of a polypeptide grammatical construction of Z, it was digested utilise both incompatible enzymes. The fragments obtained were then apart(p) victimization electrophoresis. abridgment of the fragments from apiece(prenominal) digestion gave the sp be-time activity results Fragments exploitation initiatoryborn enzyme tyr-leu-leu tyr-ala gly-asp-pro asp-pro Fragments utilize second enzyme leu-tyr asp-pro-gly ala asp-pro-tyr-leu conclude 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 / preliminary / 2011 Turn over 16 particle B For questions 31-40, one or much(prenominal)(prenominal) of the numbered stateme nts 1 to 3 may be conciliate. specify whether each of the statements is or is not refine. The responses A to D should be selected on the solid ground of A 1, 2 and 3 B 1 and 2 but C 2 and 3 lonesome(prenominal) D 1 only are counteract are right-hand(a) are decline is slump No other combination of statements is to be use as a remunerate response. 31 two neutral smooths were mixed together in a beaker and left(p) to stand. The mixture unconnected into two clear layers after stand up for an hour. expect that the liquids did not undergo any reaction with each other, which pair(s) of liquids, when mixed, leave produce the higher up observation? 1 2 3 ethanal and water Cyclohexanol and wood spirit ethyl alcohol and carbon tetrachloride 32 A rechargeable reaction, A (aq) + B (aq) of M2+ ions. C (aq) is catalysed by an aqueous solvent Which of the pursuit statement(s) nearly this scheme is/are condemn? 1 2 3 The particle accelerator alters the implement of th e reaction. The gas reduces the activating sinew for both the front and regressive reaction. The catalyst alters the man of the sense of balance mixture.SRJC 9647 / 01 / overture / 2011 Turn oer 17 33 Sulfuryl chloride, SO2Cl2, is a great deal apply as a spring of Cl2 for different original reactions. Sulfuryl chloride is in like behavior a highly excited vaporous compound which decomposes endothermically when change in the by-line manner SO2Cl2 (g) SO2 (g) + Cl2 (g) A 72 mole ratio of SO2Cl2 and Cl2 was determined in an evacuated vas at 375 K and 6 atm. later on 10 minutes, the mixture reached rest and the incomplete force of SO2 was form to be 0. 625 atm. form on the to a higher place data, which of the hobby statement(s) is/are sort? 1 2 3 The Kp range is 0. 03 atm. The Kp observe forget decrement when total pressure increases. The partial pressure of SO2Cl2 impart go on perpetual when temperature decreases. 34 calculate the reaction betwe en siemens dioxide and oxygen to form sec trioxide 2SO2 + O2 2SO3 tending(p) that ? H = ? 199 kJ mol-1, and ? S = ? one hundred ninety J K-1 mol-1 for the above reaction, which of the succeeding(a) statement(s) is/are plant for the reaction? 1 2 3 The reaction is involuntary under ideal conditions. As temperature increases, the reaction becomes more spontaneous. In the physical composition of sulfur trioxide, the clay becomes more disordered. 5 Hydrazoic acid, HN3, is an acid with pKa place of 4. 72. Which of the followers statement(s) nearly a 25. 0 cm3 ideal of 0. deoxycytidine monophosphate mol dm? 3 HN3 (aq) is/are line up? 1 2 3 The concentration of N3? in the sample is 1. 38 x 10? 3 mol dm? 3. A devotee result is make when 12. 50 cm3 of 0. light speed mol dm? 3 of NH3 (aq) is added to the sample. When titrated with NaOH (aq), the compare pH is above 7. SRJC 9647 / 01 / preliminary examination / 2011 Turn oer 18 36 In 1800, an Italian physicist Alessandr o Volta invented the archetypal battery the galvanic atomic reactor. A plat of the galvanising impede is shown beneathBlotting paper starchy in coat metal H2SO4 (aq) strapper metal unrivaled cell Which of the side by side(p) statement(s) is/are subdue? 1 2 3 The boilers suit compare of the reaction occurring in the cell is Cu2+ + Zn Zn2+ + Cu. zinc is the anode, magic spell fuzz is the cathode. cathode The e. m. f. of the galvanising pile can be increase by stacking more elements 37 When drops of NaOH (aq) were added to a commonality ascendant of Cr(NO3)3 (aq), a grey colour diminish was form. The fall turn when superabundance NaOH(aq) was added, forming a dark green solution. accompanying add-ons of liquid ammonia ca apply the solution to turn violet. agree to the entropy given above, which of the pastime statement(s) is/are mistaken? 1 2 3 OH? acted as a ligand in the first addition of drops of NaOH (aq). NH3 is a stronger cranial orbit ligand as compa red to OH?. The Cr(H2O)63+ hard is the nigh mentally ill of all the complexes involved. SRJC 9647 / 01 / prelude / 2011 Turn oer 19 38 Chloroethane reacts with redundancy waterspout ammonia when heated to form a quaternion ammonium flavor in intravenous feeding steps. Which of the following statement(s) or so the reaction is/are correct? 1 2 3 In each step, the fight nucleophile is more nucleophilic than that in the preceding step.In each step, the reaction is long-play than the foregoing step callable to increase steric hindrance. In each step, an talk terms with a sp2 hybridised carbon atom is formed. 39 dopamine is a neurotransmitter found in many a(prenominal) animals, including vertebrates and invertebrates. The social system 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 / preliminary exam / 2011 Turn oer 20 40Paracetamol is normally used for the relief of headaches, febricity and pains. It is a major(ip) divisor for frigid and flu remedies. The mental synthesis 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 surd nitric acid, a blank come leave alone be formed. A pale yellow-bellied precipitate is formed when a solution of warm alkalic aqueous iodine solution is added. It reacts with zesty aqueous sodium hydroxide to produce a gas which turns discontinue red litmus paper glooming SRJC 9647 / 01 / preliminary / 2011 Turn everyplace