MJC H2 CHEM P1 QP

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2 [Turn over 1 W hen an excess of K I solution was added to 10.0 cm 3 of a 0.200 moldm -3 solution of JO4 3-, the iodine liberated was titrated against a standard solution of 0.100 moldm-3 of sodium thiosulfate, Na2S2O3, using starch as the indicator. 2S2O3 2- + I2 → S4O6 2- + 2I- If the volume of sodium thiosulfat e required to discharge the blue-black colouration is 40.00 cm3, what is the final oxidation state of J? A -3 B +1 C +2 D +3 2 The temperature of a 2.0 dm 3 sample of a gas was changed from 27ºC to kºC, with its pressure changed from 1 atm to 2 atm. Its final volume remained at 2.0 dm3. What is the value of k? A 13.5 C 327 B 54 D 600 3 Which of the following ions would und ergo the greatest deflection in an electric field? A 16O2 + B 16O18O+ C 16O18O2+ D 18O2+ 4 Compound formula b.p . / oC Water H 2O 100 Hydroxylamine NH 2OH 58 Ammonia NH 3 –33 Which of the following statements is not able to explain the above observations? A Hydroxylamine has a higher boiling point than ammonia as the hydroxylamine can form more hy drogen bonds per molecule than ammonia B Hydroxylamine has a lower boiling poi nt than water as the N-O bond in hydroxylamine results in weaker hydrogen bonding. C Water has a higher boiling point t han ammonia as the O-H bond in water results in stronger hydrogen bonding. D Water has a higher boiling point t han hydroxylamine as water can form more hydrogen bonds per molecule than hydroxylamine.

3 [Turn over 5 Which of the following pairs of subst ances have different types of bonding and structure? A A lF3 A lCl3 B BaF 2 Ba I2 C HC l HBr D Si SiO 2 6 Bromine is formed by t he reaction between bromate(V) ions and bromide ions and acid: BrO3 - (aq) + 5Br - (aq) + 6H+ (aq)  3Br2 (aq) + 3H2O (l) The results of some experiments on the reaction at a given temperature T are shown below. Experiment Concentration / moldm-3 Initial rate / moldm-3s-1 BrO3 - Br - H + 1 0.10 0.10 0.10 1.2 x 10 -3 2 0.10 0.30 0.10 3.6 x 10 -3 3 0.20 0.10 0.10 2.4 x 10 -3 4 0.20 0.10 0.20 9.6 x 10 -3 Which of the following statements is correct based on the above data? A The overall order of reaction is three. B The rate of reaction is independent of [BrO 3 -]. C The rate constant of th is reaction at temperature T is 12 mol-3 dm9 s-1. D The time taken for the concentration of Br - to decrease to half its initial value is the same for Experiment 1 to 4.

7 8 N m The value What is t h 440ºC? A 0.1 2 B 0.5 C 2 D 4 L and M c In an ex p pressure P intervals o pressure P are shown Which one A Th e B Th e C The D Th e Number of moles of R of the equ he value o H 25 can react t L periment, P and temp of time w a P, but at a n below. e of the foll e value of K e equilibriu e enthalpy e activation f R uilibrium co H2 (g) + I2 of the eq u HI (g) ogether to L(g) + M(g) 1.0 mole perature 35 as record e a temperat lowing info Kc decreas m is achie change fo n energy of 4 onstant for 2 (g) uilibrium c ½ H2 ( reach equ ) Q each of 50ºC. The ed. The e x ture of 70 0 ormation ca ses with an eved at a fa or the forwa f the forwa the reactio 2HI (g) constant f o g) + ½ I2 (g uilibrium in Q (g) + R(g L and M amount of xperiment 0ºC. The r annot be d n increase aster rate a ard reactio ard reaction on below is or the foll o g) the reactio g) were re a f R presen was repe a esults for deduced fr in tempera at higher te n is negati n is high. [Tu s 0.25 at 4 owing rea c on below. acted at c nt in the mix ated at th e both expe rom the gra ature. emperature ive. rn over 40ºC. ction at constant xture at e same riments aph? es.

5 [Turn over 9 At 298 K, the numerical values for the dissociation constant of the aliphatic carboxylic acids, RCO 2H and R ’CO2H in aqueous solution are 2.1 x 10 -8 and 2.2 x 10-4 respectively. Which of the following can be inferred from the given information? A The volume of 1.0 moldm -3 NaOH used to neutralize RCO 2H completely is lower than that for R’CO2H. B The volume of 1.0 moldm -3 HC l used to neutralize RCO 2 -Na+ completely is lower than that for R’CO2 -Na+. C RCO2H is a stronger acid than R’CO2H. D RCO2 - is a stronger base than R’CO2 -. 10 20.0 cm 3 of 0.10 moldm −3 sulfuric acid was mixed with 22.0 cm 3 of 0.12 moldm−3 aqueous ammonia. What is the pH of the resulting solution? A 1.49 C 3.17 B 2.87 D 13.08 11 The value of the ionic product of water, Kw varies with temperature. Temperature / oC Kw / mol2 dm-6 25 1.0 x 10 -14 62 1.0 x 10 -13 What can be deduced from this information? A Water is acidic at 62 C. B The pH of water increases as temperature increases. C The ionic dissociation of wa ter is an exothermic process. D [OH -] ions in water increases as temperature increases.

6 [Turn over 12 Consider the following reaction where edta4- forms a complex with a transition metal ion M+: [M(NH3)6]+ + edta4- → [M(edta)]3- + 6NH3 The complex [M(edta)]3- formed has the structure: Which of the following statements about the spontaneity of the reaction is true? A The reaction is non-spontaneous at all temperatures. B The reaction is only spont aneous at low temperatures. C The reaction is only spont aneous at high temperatures. D The reaction is spontaneous at all temperatures. 13 Which of these pairs of substances, when mixed, would lead to the highest increase in temperature of the resulting solution? A 50 cm 3 of 1 moldm-3 HCl and 50 cm3 of 1 moldm-3 KOH B 50 cm 3 of 1 moldm-3 HCl and 50 cm3 of 1 moldm-3 NH3 C 50 cm 3 of 0.5 moldm-3 H2SO4 and 100 cm3 of 1 moldm-3 KOH D 100 cm 3 of 0.5 moldm-3 HCl and 100 cm3 of 0.5 moldm-3 KOH

7 [Turn over 14 A student set up 4 standard half-cells each containing one of