NJC 2022 H1 Chem Promo P1 QP

NJC SH1 Promotional Examination 8873/01/2022 [Turn over 1 NATIONAL JUNIOR COLLEGE SH1 Promotional Examination Higher 1 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Optical Answer Sheet Data Booklet 8873/01 29 September 2022 40 mins READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, subject class and registration number on the Answer Sheet in the spaces provided unless this has been done for you. There are twenty 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 this booklet. The use of an approved scientific calculator is expected, where appropriate. Instructions on how to fill in the Optical Mark Sheet Shade the index number in a 5 digit format on the optical mark sheet: 2nd digit and the last 4 digits of the Registration Number. Example: Student Examples of Registration No. Shade: 2205648 25648 This document consists of 8 printed pages.

NJC SH1 Promotional Examination 8873/01/2022 2 1 How many hydrogen atoms are present in 4.0 g of methane? (L = Avogadro constant) A L 16 B L 4 C L D 4L 2 The table shows the relative abundance of a sample of naturally occurring isotopes of zinc. isotope relative abundance Zn30 64 10 Zn30 65 8 Zn30 67 2 Zn30 68 1 What is the relative atomic mass of this sample of zinc? A 64.0 B 64.9 C 68.1 D 72.2 3 Analysis of a mixture of two sulfur-containing gases show that H2S and CS2 are present in a 3 : 1 mole ratio. This mixture is burned in excess oxygen to give CO2 and SO2 gas. What is the mole ratio of the gases CO2 : SO2 obtained after complete combustion? A 1 : 2 B 1 : 3 C 1 : 4 D 1 : 5 4 2 moles of an oxidising agent, XO4−, in the presence of excess acid, oxidised 96.0 dm3 of nitrogen dioxide gas to NO3− at room temperature and pressure. What is the number of moles of electrons accepted by one mole of XO4−? A 1 B 2 C 3 D 4

NJC SH1 Promotional Examination 8873/01/2022 [Turn over 3 5 The first six ionisation energies of an element, Y, in kJ mol‒1 are shown. 1st 2nd 3rd 4th 5th 6th Ionisation Energy / kJ mol−1 738 1451 7733 10543 13630 18020 Y forms an oxide by heating Y with oxygen gas. What is the molecular formula of the oxide of Y formed? A YO B YO2 C Y2O D Y2O3