NJC_MCQ Final Prelim

Candidate Name: ____________________________________ Class: ________ National Junior College JC2/IP4 Preliminary Examination 2008 H1 CHEMISTRY (8872/1) Paper 1 10 September 2008 TIME: 50 mins INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write your NAME, the SUBJECT TITLE , your class and registration number on the optical mark sheet provided. There are 30 questions in 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 2B pencil in the optical mark sheet. Submit the optical mark sheet at the end of the examination. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer. A Data Booklet is provided. You may use a calculator. This question paper consists of 12 printed pages (including this page) Shade the index no. in 5 digit format (ABCDE) A: Year of admission 7 = JC2 (2007) 5 = IP (2005) BC: civics class DE: registration no. Eg: 07S0109 = 70109 04IP0215 = 50215 Tan Ah Teck H1 Chemistry Prelims 2008 07S0109 1

1 Which one of the following has the same number of particles as one mole of copper atoms? A The number of ions in 2 dm 3 of 0.25 mol dm−3 of aqueous nitric acid. B The number of delocalised electrons in one mole of magnesium metal. C The number of atoms in 71 g of chlorine gas. D The number of ions in 58.5 g of sodium chloride. 2 Use of the Data Booklet is relevant to this question. The components of a 100 g sample of fertilizer is as shown in the table below: Element Mass / g N 15 P 30 K 15 Other Elements 40 The recommended usage of fertilizer is 14 g of fertilizer per 5 dm3 of water. What is the concentration of nitrogen atoms in this recommended solution? A 0.03 mol dm −3 C 0.42 mol dm−3 B 0.05 mol dm−3 D 0.75 mol dm−3 3 Which one of the following pairs of ions contains two underlined elements having the same oxidation number? A Cl O4 − SO4 2− B MnO4 − MnO4 2− C CrO4 2− Cr2O7 2− D CO3 2− NO3 − 2

4 Which one of the following shows the correct bond angles x, y and z for ethanoic acid as shown below? x y z A 90 180 180 B 90 90 180 C 109.5 120 120 D 109.5 120 105 x H CC O OHH H z y 5 Which one of the following pairs of molecules have the same shape? A CO 2 and H2O B BF3 and NH3 C NH3 and PF3 D CH4 and SF4 6 Which one of the following cannot be explained by hydrogen bonds? A CH 3CHO has a higher boiling point than C2H6. B CH3COOH has a Mr of 120 in benzene. C HF has a higher boiling point than HCl. D CH3COCH3 is miscible with water. 7 Which one of the following electronic configuration represents an element that forms a simple ion with a charge of −2? A 1s2 2s2 2p6 3s2 B 1s2 2s2 2p6