2022 XMS Chem Prelims P1

3 6092/Chemistry/Paper 1/2022 Prelim Exam XINMIN SECONDARY SCHOOL CHEMISTRY PRELIMS 2022 P1 1 An unknown white solid, M, melts between 171 °C and 174 °C. When chromatography is performed with water as the solvent, M produces only one spot on the chromatogram. Which statement must be true about M? A M can sublime. B M is an ionic compound. C M is impure as it melts over a range of temperatures. D M is pure as it produced only 1 spot on the chromatogram. 2 The apparatus shown in the diagram below was set up by a student to measure the volume of carbon dioxide gas produced when different masses of marble chips were added to 25 cm3 of dilute hydrochloric acid. Which other apparatus did the student use for his experiment? A Filter funnel and mass balance B Filter funnel and stopwatch C Measuring cylinder and mass balance D Measuring cylinder and stopwatch 3 Two isotopes of carbon, C-12 and C-13 are found combined in a giant molecule. The average relative atomic mass of carbon in the giant molecule is 12.4. What is the proportion of C-12 atoms in the giant molecule? A 50% B 60% C 70% D 80% ���

4 6092/Chemistry/Paper 1/2022 Prelim Exam 4 Three elements X, Y and Z belong to the same period in the Periodic Table. The properties of the oxide formed by the three elements are shown below. oxide of X: Insoluble in water and aqueous sodium hydroxide but dissolves readily in dilute hydrochloric acid oxide of Y: Has low boiling point and does not react with both aqueous sodium hydroxide and dilute hydrochloric acid oxide of Z: Insoluble in water but dissolves in both aqueous sodium hydroxide and dilute hydrochloric acid Based on the statements above, arrange X, Y and Z in order of increasing atomic number in the Periodic Table. A X, Y, Z B Y, X, Z C X, Z, Y D Y, Z, X 5 Elements X and Y are in Group VII of the Periodic Table. X is a liquid while Y is a solid at room temperature and pressure. Which statement is correct? A Atoms of X has more protons than atoms of Y. B X displaces Y from an aqueous solution of Y. C Y is a stronger oxidising agent than X. D Molecules of Y have more atoms than molecules of X. 6 What can be deduced about two gases that have the same relative molecular mass? A They have the same rate of diffusion at room temperature and pressure. B They have the same solubility in water at room temperature. C They have the same number of atoms in one molecule. D They have the same boiling point. ���

5 6092/Chemistry/Paper 1/2022 Prelim Exam 7 Which substance will react with dilute sulfuric acid to produce a colourless solution only? A zinc hydroxide B copper(II) oxide C sodium carbonate D barium chloride 8 An ion has 23 electrons and a mass number of 56. What is the charge on the ion if it has 30 neutrons? A -2 B +2 C -3 D +3 9 The table below shows the physical properties of substances P, Q, R and S. Substance Melting point / °C Electrical conductivi