NYJC_H1_Chemistry_P1

NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8872/01 Paper 1 Multiple Choice 26 September 2014 50 minutes Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and tutor’s name on the Answer Sheet in the spaces provided unless this has been done for you. 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 you choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. This document consists of 15 printed pages and 0 blank page. [Turn over

2 H1 Chemistry 8872/02 NYJC J2/14 PX Section A For each question there are four possible answ ers, A, B, C and D. Choose the one you consider to be correct. 1 0.02 mol of C xHyNO2 was burned in excess oxygen as shown by the equation below. CxHyNO2 + aO2  xCO2 + NO2 + 2 y H2O The gases that were produced were first passed th rough a U -tube containing phosphorus pentoxide and then bubbled through 0.25 mol of NaOH(aq). The equations illustrating the reactions of the gases with NaOH(aq) are as shown below. CO2 + 2NaOH  Na2CO3 + H2O 2NO2 + 2NaOH  NaNO2 + NaNO3 + H2O The phosphorus pentoxide U -tube increased in mass by 1.15 g and the excess NaOH(aq) required 40.00 cm3 of 0.875 mol dm3 H2SO4 for complete reaction. What is the ratio of x:y? A 2:3 B 4:3 C 4:7 D 8:7 2 An acidified solution of the salt KClO z will oxidise Ti 3+(aq) to Ti 4+(aq) quantitatively, the chlorine being reduced to Cl(aq). When 0.170 g of the salt KClO z was reacted with 0.400 mol dm 3 Ti3+(aq) in the presence of H+(aq), 24.50 cm3 of Ti3+(aq) was needed for complete reaction. What is the value of z? A 1 B 2 C 3 D 4

3 H1 Chemistry 8872/01 NYJC J2/14 PX [Turn over 3 Which of the following ions has one more electron in the third quantum shell than in the second quantum shell? A Ca2+ B Cl C Sc+ D S2 4 In w hich of the following pairs does species I have a smaller bond angle than species II? I II A AsCl3 ClO2  B CS2 SO4 2- C NO2  NO3  D PH4 + SF6 5 Which of the following statements about the properties associated with ionic and covalent bonds is correct? A The only covalent compounds with high melting points are those in which hydrogen bonds occur. B Any covalent compound that contains both oxygen and hydrogen in its molecule forms hydrogen bonds. C Any ioni c bonds and covalent bonds cannot both occur in the same compound. D Ionic compounds differ from metals in that ionic com pounds do not condu