CJC_H2_CHEM_P1_QP Prelim

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2 9647/01/CJC JC2 Preliminary Exam 2015 Section A For each question there are four possible answers, A, B , C and D . Choose the one you consider to be correct and record your choice in soft pencil on the separate Answer Sheet provided. 1 When 20 cm 3 of a gaseous hydrocarbon was completely burnt in 130 cm 3 of oxygen, the volume of gas remaining after the reaction was 100 cm 3. This volume was decreased to 40 cm 3 when the resulting mixture was passed through aqueous sodium hydroxide. All measurements were made at room temperature and pressure. What is the formula of this hydrocarbon? A C2H2 B C 3H6 C C3H8 D C4H10 2 Consider the following half-equations: C2O4 2– → 2CO2 + 2e– Fe2+ → Fe3+ + e– MnO4 – + 8H+ + 5e– → Mn2+ + 4H2O What volume of 0.01 mol dm –3 potassium manganate( VII) is required to oxidise completely 25.0 cm3 of an acidified solution of 0.01 mol dm–3 FeC2O4? A 10 cm3 B 15 cm 3 C 25 cm3 D 42 cm3 3 X and Y are elements with atomic numbers between 6 and 15. Their first seven ionisation energies in kJ mol–1 are shown below. X 580 1800 2700 11600 14800 18400 23300 Y 1310 3400 5300 7500 11300 13300 71300 Which of the following best describes the compound formed between X and Y? A basic B acidic C neutral D amphoteric

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