RI 2021 Prelim P1 QP

© Raffles Institution 2021 9729/01/S/21 [Turn Over RAFFLES INSTITUTION 2021 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 23 September 2021 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. 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 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 the question booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages.

© Raffles Institution 2021 9729/01/S/21 [Turn Over 2 1 The shape of each p-orbital is represented as two lobes. How many electrons does Cu have in orbitals with four lobes? A 7 B 8 C 9 D 10 2 Use of the Data Booklet is relevant to this question. Ionisation energy generally increases across a period. In Period 2, there are two irregularities which cause ionisation energy to be lower than expected. The graph below shows the 2 nd ionisation energies of four consecutive elements with atomic numbers less than 20. What is a possible identity of K? 1 boron 2 carbon 3 oxygen 4 fluorine A 1 and 3 B 2 and 4 C 1 only D 2 only 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 A B C D E F G H J K L M element 2nd ionisation energy

© Raffles Institution 2021 9729/01/S/21 [Turn Over 3 3 Q has the following physical properties. • It is non-volatile. • It does not conduct electricity in its standard state. • It dissolves in water. What is the identity of Q? A nitrogen dioxide B silicon dioxide C sodium D sodium oxide 4 Beryllium is diagonal to aluminium in the Periodic Table and they share similar properties. Which structures for the compounds of beryllium and fluorine are possible? 1 2 3 A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 3 only

© Raffles Institution 2021 9729/01/S/21 [Turn Over 4 5 X, Y and Z are elements in the third period of the Periodic Table. The oxide of X is amphoteric, the oxide of Y is basic and the oxide of Z is acidic. What is the order of increasing ionic radius for these three elements? A X < Y < Z B X < Z < Y C Y < X < Z D Y < Z < X 6 Use of the Data Booklet is relevant to this question. Which metal ion has the highest Ka? A [Co(H2O)6]3+ B [Mg(H2O)6]2+ C [Mn(H2O)6]