2026 H2 Timed Practice Paper 1 MCQ (Question Paper)

1 NJC SH2 Timed Practice 9476/1/26 [Turn over NATIONAL JUNIOR COLLEGE SH2 TIMED PRACTICE Higher 2 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Optical Answer Sheet Data Booklet 9476/01 16 July 2026 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, 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 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. A Data Booklet is provided. 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: 2505648 55648 This document consists of 16 printed pages including 1 blank page..

2 NJC SH2 Timed Practice 9476/1/26 1 Use of the Data Booklet is relevant to this question. Which sample of gas contains twice the number of atoms as 4 g of helium gas, He? A 4 g of hydrogen, H2 B 8 g of methane, CH4 C 12 g of steam, H2O D 22 g of carbon dioxide, CO2 2 The isotope of an element has a nucleon number of 112. It forms an ion with a charge of +2 with the electron configuration [Kr]4𝑑10. How many protons, neutrons, and electrons are present in this ion? A 46 protons, 66 neutrons, 44 electrons B 46 protons, 66 neutrons, 46 electrons C 48 protons, 64 neutrons, 46 electrons D 48 protons, 64 neutrons, 44 electrons 3 An element R consists of four isotopes. The table below shows the percentage abundance of the isotopes. Relative isotopic mass Percentage abundance /% 90.0 50.0 91.0 10.0 92.0 20.0 94.0 20.0 What is the relative atomic mass of R? A 91.00 B 91.30 C 91.75 D 92.00

3 NJC SH2 Timed Practice 9476/1/26 [Turn over 4 An element X has the following successive ionisation energies. 1st 2nd 3rd 4th 5th Ionisation energy /kJ mol⁻1 786 1580 3230 4360 16000 Given that the oxide of X is acidic and is insoluble in water, which statement about X is correct? A X is a gas at room temperature. B X forms a chloride with a formula XCl5. C The oxide of X has a linear shape with no dipole moment. D The oxide of X has a giant covalent lattice with a high melting point. 5 Which option correctly describes the shape and polarity of the species? species shape polarity A AlCl3 trigonal planar polar B SiF4 square planar non-polar C BrF3 trigonal pyramidal polar D BeCl2 linear non-polar 6 When 10 cm3 of a gaseous hydrocarbon was sparked with excess oxygen gas and cooled to room temperature, the gaseous mixture contracted by 30 cm3. When the residual gas was passed through aqueous potassium hydroxide, there was a further contraction of 40 cm3. What is the hydrocarbon? A C3H8 B C4H8 C C4H6 D C4H10

4 NJC SH2 Timed Practice 9476/1/26 7 Which diagram correctly describes the behaviour of a fixed mass of an ideal gas? (T is measured in K.) A B C D 8 Liquefaction can be defined as a process that turns a gas into a liquid by increasing the pressure at a constant temperature. In the liquefaction of CH4 and NH3, the pressure needed for NH3 is less than CH4. Which reason best explains this observation? A NH3 has stronger intermolecular forces of attraction than CH4. B NH3 has lower bond energy than CH4. C NH3 molecules are bigger than CH4 molecules. D NH3 molecules possess less kinetic energy than CH4 molecules. 9 Use of the Data Booklet is relevant to this question. Hexamine has an enthalpy change of combustion of –4288 kJ mol–1. 12.4 g of hexamine tablets were burnt to heat up 850 g of water. Given that the process was 75% efficient and temperature of the water increased from 10°C to 90°C, what is the molar mass of hexamine? A 124.7 g mol–1 B 140.3 g mol–1 C 187.1 g mol–1 D 249.4 g mol–1

5 NJC SH2 Timed Practice 9476/1/26 [Turn over 10 Use of Data Booklet is relevant to this question. Nitrous oxide, N 2O, commonly known as laughing gas, contains one N=N bond and one N=O bond per molecule. It burns in ethyne, HC ≡CH, to produce water vapour, carbon dioxide and nitrogen gas as the only products. 5N2O(g) + C2H2(g) → H2O(g) + 2CO2(g) + 5N2(g) By making use of the following data: Bond energy / kJ mol–1 N=N 418 N=O 686 Calculate the enthalpy change of the above reaction. A +1930 kJ mol–1 B +2260 kJ mol–1 C –1680 kJ mol–1 D –3980 kJ mol–1 11 Using the enthalpy changes below, calculate the standard enthalpy change of formation of gaseous hydrogen chloride. enthalpy change/ kJ mol–1 N2(g) + 3 H2(g) → 2NH3(g) –92 N2(g) + 4 H2(g) + Cl2 (g) → 2NH4Cl (s) –629 NH3(g) + HCl (g) → NH4Cl (s) –176 A – 46.3kJ mol–1 B – 92.5 kJ mol–1 C –180 kJ mol–1 D – 361 kJ mol–1

6 NJC SH2 Timed Practice 9476/1/26 12 Which graph corresponds to the combustion of liquid ethanedioic acid, (COOH) 2 at increasing temperature (before the boiling point of water)? (COOH)2(l) + ½ O2(g) → 2CO2(g) + H2O (l) 13 The rate equation for a reaction is: rate = k[P]²[Q]. If the concentration of P is tripled and the concentration of Q is halved, what would be the new rate compared to the original rate? A 1.5 times B 3 times C 4.5 times D 9 times

7 NJC SH2 Timed Practice 9476/1/26 [Turn over 14 Crotonaldehyde, CH 3CH=CHCHO, can be obtained by oxidising butadiene, CH2=CHCH=CH2, using air or oxygen. One method is to pass a mixture of butadiene and oxygen through a hot aqueous solution of palladium( II) ions, Pd2+(aq), which catalyses the reaction. Which statements are correct about the action of the Pd2+(aq) ions? 1 Changing the concentration of Pd2+(aq) will have an effect on the rate of the reaction. 2 Pd2+(aq) increases the energy of the reacting molecules. 3 Pd2+(aq) lowers the activation energy for the reaction. 4 When Pd2+(aq) is used, the reaction proceeds by a different route. A 1, 2 and 3 B 2, 3 and 4 C 1, 3 and 4 D All correct 15 Initially, there was 1 mol of neon gas at temperature T 1 in an enclosed system. 0.5 mol of neon gas was added and the temperature was increased to T2. Amount of neon gas/ mol Temperature Beginning 1 T1 Final 1.5 T2 Which diagram correctly represents the Boltzmann distribution of molecular speeds before and after the changes were made? A B C D T2 molecular speed proportion of molecules T1 T1 molecular speed proportion of molecules T2 T1 molecular speed proportion of molecules T2 T1 molecular speed proportion of molecules T2

8 NJC SH2 Timed Practice 9476/1/26 16 The graph below shows the melting points of four consecutive Period 3 elements W to Z. Which graph represents the correct trend of the stated property for W to Z? A