2025 H2 Chem Prelim P1 QP VJC

© VJC 2025 9729/01/PRELIM/25 [Turn over VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 19 September 2025 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 group and VJC index number 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 this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 12 printed pages

2 © VJC 2025 9729/01/PRELIM/25 For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Use of the Data Booklet is relevant to this question. Berkelium, Bk, and Fermium, Fm, are both actinoids. An isotope of Bk2+ and an isotope of Fm3+ have 249 and 252 nucleons respectively. Which row of the table is correct? ion containing larger number of neutrons ion containing larger number of electrons A Bk2+ Fm3+ B both the same Fm3+ C Fm3+ Bk2+ D both the same Bk2+ 2 Consider the atoms of the Period 3 elements from Na to Ar. What is the total number of paired electrons in the valence shells of these eight elements? A 26 B 28 C 30 D 32 3 The boiling points of HF, HCl and HBr are different. HCl has the lowest boiling point. Which statements are correct? 1 HCl has a lower boiling point than HBr because HC l molecules have weaker permanent dipole-permanent dipole forces of attraction. 2 HF molecules experience weaker temporary dipole -induced dipole forces of attraction than HBr molecules. 3 HF molecules experience stronger permanent dipole-permanent dipole forces of attraction than HCl molecules. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 3 only

3 © VJC 2025 9729/01/PRELIM/25 [Turn over 4 The diagram shows the structure of a pyruvic acid. pyruvic acid What set of bond angles are present in pyruvic acid? A 180o, 120o, 90o B 180o, 120o, 109o C 120o, 105o, 90o D 120o, 109o, 105o 5 Which statement applies to both ideal and real gases? A Collisions between molecules are elastic. B Molecules are in constant random motion. C Molecules attract each other. D Molecules have zero size. 6 Acetylene (C 2H2) is unable to react with water but is able to react with a strong base like sodium amide (NaNH2). Which of the following statements is correct? A Acetylene acts as an Arrhenius acid as it contains a hydrogen atom. B Acetylene does not act as an Arrhenius acid as it unable to dissociate in water to form H3O+. C The conjugate base of acetylene is HC≡CNa. D Acetylene acts as a Lewis acid in the reaction with sodium amide.

4 © VJC 2025 9729/01/PRELIM/25 7 The three minerals below are known as double carbonates, which are carbonates containing 2 metallic elements. Double carbonates decompose in two steps, with each step involving the decomposition of one of the metallic carbonates that it contains. The decom position of the carbonates releases carbon dioxide, which helps to smother fire, thus acting as fire retardants. mineral chemical formula dolomite CaMg(CO3)2 huntite Mg3Ca(CO3)4 norsethite BaMg(CO3)2 Which row correctly shows the relative effectiveness of the minerals as a fire retardant? most effective least effective A dolomite huntite norsethite B norsethite dolomite huntite C norsethite huntite dolomite D huntite dolomite norsethite 8 A student carries out an investigation using phosphorus ( V) oxide. All experiments are carried out room temperature. Which observations would the student make of the results of these experiments? A No solid remains in any experiment. B A solid remains in one experiment only. C A solid remains in two experiments only. D Solid remains in all three experiments.

5 © VJC 2025 9729/01/PRELIM/25 [Turn over 9 Compound G, C7H12O3, is a diesel fuel additive which reduces the amount of soot formed when the fuel burns. compound G How many moles of oxygen gas are needed to completely burn 1 mole of compound G? A 8.5 B 9.0 C 9.5 D 10.0 10 Magnesium(I) chloride, MgCl, does not exist as a stable compound but its lattice energy can be estimated. What is the predicted order of increasing magnitude of lattice energy of MgC l, MgCl2 and SrCl2? A MgCl, MgCl2, SrCl2 B MgCl, SrCl2, MgCl2 C MgCl2, SrCl2, MgCl D SrCl2, MgCl, MgCl2 11 Some Hfo values are given below. compound Hfo / kJ mol–1 H2O(l) –286 CO2(g) –394 C6H12O6(s) –1273 The overall reaction in photosynthesis can be represented by the following equation. 6CO2(g) + 6H2O(l) → C6H12O6(s) + 6O2(g) Which of the following statements are correct? 1 The enthalpy change of the reaction is +2807 kJ mol–1 2 In the formation of products, the system becomes less disordered. 3 The reaction is not spontaneous at all temperatures. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only

6 © VJC 2025 9729/01/PRELIM/25 12 The hydrolysis of ethyl ethanoate in aqueous solution can be catalysed by hydrogen ions from sulfuric acid. To determine the order of this reaction with respect to hydrogen ions, which method should be used? A Measure the change in pH during the reaction. B Measure the rate of the reaction several times, but with a different concentration of ethyl ethanoate each time. C Measure the rate of the reaction several times, but with a different concentration of sulfuric acid each time. D Remove samples at various time intervals and titrate against a standard solution of aqueous sodium hydroxide. 13 The mechanism below has been proposed for the reaction of CHCl3 with Cl2. Step 1: Cl2(g) ⇌ 2Cl(g) fast Step 2: Cl(g) + CHCl3(g) → CCl3(g) + HCl(g) slow Step 3: CCl3(g) + Cl(g) → CCl4(g) fast Which of the following rate equations is consistent with this mechanism? A rate = k[CHCl3][Cl] B rate = k[CHCl3][Cl2] C rate = k[CHCl3][Cl2]1/2 D rate = k[CHCl3] [Cl2] 14 The rates of chemical reaction can be increased by increasing the concentration of reactants, raising the temperature or adding a catalyst. Which statement is not correct? A Increasing the temperature increases the proportion of particles having energy greater than the activation energy. B Adding a catalyst increases the proportion of particles having energy greater than the activation energy. C Increasing the temperature increases the rate constant. D Increasing the concentration of the reactants increases the rate constant.

7 © VJC 2025 9729/01/PRELIM/25 [Turn over 15 The structure of an amino acid, Selenocysteine, w