DHS_H1_CHEM_P1_QP_ans_FINAL

This question paper consists of 12 printed pages and 0 blank page. © DHS 2015 [Turn over Name: Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination 2015 Year 6 H1 CHEMISTRY 8872/01 Paper 1 Multiple Choice 29 September 2015 50 minutes Additional Materials: Optical Mark Sheet Data Booklet INSTRUCTIONS TO CANDIDATES 1 Write your name and class on this question paper. 2 There are thirty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Optical Mark Sheet. 3 Each correct answer will score one mark. A mark will not be deducted for wrong answer. 4 Any rough working should be done in this booklet. 5 You may use a calculator.

2 © DHS 2015 8872/01 Section A For each question, there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 10 cm 3 of gaseous hydrocarbon was completely burnt in 80 cm 3 of oxygen (present in excess) at 425 K. After cooling to room temperature, the volume of the gaseous mixture decreased to 55 cm3. A further reduction of 40 cm3 was observed when the residual gas was passed through calcium hydroxide. All gas volumes were measured at room temperature and pressure. What is the formula of the hydrocarbon? A C3H8 B C4H8 C C4H10 D C5H12 2 Chlorine gas is a severe irritant to the eyes and respiratory system. The maximum safe toleration level of chlorine gas in air is 0.005 mg dm –3. How many atoms of chlorine gas are present in 2 dm 3 of air at this toleration level? A 2310671 2 1000 005.0 xxx B 2310671 4 1000 005.0 xxx C 231061000271 005.0 xxxx D 23106471 005.0 xxx 3 0.5 g of zinc powder was found to reduce an acidified solution of 25.50 cm 3 of 0.200 mol dm–3 VO2 +. Which one of the following is the reduced product of VO2 +? A VO3 – B VO2+ C V3+ D V2+ 4 In 1999 Russian chemists claimed to be the first to identify atoms of a new element of proton number 114. This was produced by bombarding atoms of plutonium, Pu, with atoms of an isotope of a Group II element, X. This reaction taking place is as shown:    nneutronselementnewXPu 1 0 289 114 244 94 3 What is element X? A Mg B Ca C Sr D Ba

3 © DHS 2015 8872/01 5 Which of the following chemical species contains the most number of unpaired electrons? A P– B N2– C Ti+ D Cu+ 6 The elements P and Q are in groups VI and VII respectively in the same period. Which of the following statements regarding P and Q is most likely to be true? A PQ2 is linear in shape. B PQ4 is a non–polar molecule. C P is more electronegative than Q. D The first ionisation energy of P will likely be les