NYJC_2023_H2_Chemistry_9729_P1

[Turn Over This document consists of 19 printed pages. NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 21 September 2023 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, CT and NRIC / FIN on the Answer Sheet in the spaces provided. There are thirty 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 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. The use of an approved scientific calculator is expected, where appropriate.

2 H2 Chemistry 9729/01 NYJC J2/2023 PRELIM 1 When Tl+(aq) ions are reacted with VO3 –(aq) ions, Tln+(aq) ions and V2+(aq) ions are formed. Assuming the reaction goes to completion, 3 mol of T l+(aq) and 4 mol of VO3 –(aq) would result in a mixture containing equal number of moles of VO3 –(aq) and V2+(aq). What is the value of n? A 2 B 1 3 C 4 D 5 2 Two elements E and G have the following properties.  E and G form ionic compounds Na2E and Na2G with sodium respectively.  When reacted with fluorine, only GF6 is formed but not EF6. Which pair of electronic configurations of E and G is correct? E G A [He]2s22p4 [Ne]3s23p4 B [He]2s22p2 [Ne]3s23p4 C [Ne]3s23p4 [He]2s22p4 D [Ne]3s23p4 [He]2s22p2

3 H2 Chemistry 9729/01 NYJC J2/2023 PRELIM [Turn Over 3 A compound with an unknown central atom J has the following shape. J O 107 o Cl Cl Which of the statements are correct about this compound? 1 There are 3 bond pairs and 1 lone pair around the central atom J. 2 There are a total of 10 electrons around the central atom J. 3 Element J is in Group 15 of the Periodic Table. 4 Element J is less electronegative than oxygen. A 1 and 2 only B 2, 3 and 4 only C 1, 2 and 4 only D 1, 3, and 4 only 4 BF3 reacts with (CH3)3N to give (CH3)3NBF3. Which statement is correct? A (CH3)3NBF3 contains hydrogen bonds. B The B atom in (CH3)3NBF3 is not electron deficient. C (CH3)3N is the Lewis acid while BF3 is the Lewis base. D N and B atoms in (CH3)3NBF3 are trigonal pyramidal and trigonal planar in shape respectively.

4 H2 Chemistry 9729/01 NYJC J2/2023 PRELIM 5 A given mass of a diatomic gas was placed in a vessel of fixed volume V cm3 at a pressure p atm and temperature T C. Assuming ideal behaviour, which of the following changes would cause the density of the gas to double? A Cooling the gas to ½ T C. B Adding a catalyst that causes the gas to dissociate into ga