NYJC 2021 Prelim 9729 P1

[Turn Over This document consists of 14 printed pages.. NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 21 September 2021 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 and NRIC / FIN on the Answer Sheet in the spaces provided. There are thirty questions in 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.

2 H2 Chemistry 9729/01 NYJC J2/2021 PRELIM. 1 The mass percentage of magnesium in a mixture of magnesium chloride and magnesium nitrate was found to be 21.25 %. What mass of magnesium chloride is present in 100 g of the mixture? A 47 g B 1 53 g C 56 g D 61 g 2 10.00 cm3 of 0.500 mol dm3 of a metal oxide, M2On, reacted exactly with 20.00 cm3 of 0.300 mol dm3 of acidified potassium manganate(VII) solution. Given that the oxidation state of M in the product is +6, what is the value of n? A 1 B 2 C 3 D 4 3 The first six ionisation energies of an element, Q, in kJ mol1 are shown. 660; 1267; 2218; 3313; 7863; 9500 What can be inferred from the data provided? A Q is a Period 3 element. B Q forms an oxide with a giant molecular structure. C Q is likely to form a chloride with the formula QCl4 when reacted with chlorine. D Q has a lower first ionisation energy than the element preceding it in the Periodic Table. 4 Which of the following statements are correct? 1 The van der Waals radius of chlorine is larger than the van der Waals radius of argon. 2 The boiling point of N2H4 is higher than CH3CH2CHO as hydrogen bonds between N2H4 molecules are more extensive than the hydrogen bonds between CH3CH2CHO molecules. 3 The carboncarbon bond length is longer in diamond than in graphite. A 1, 2 and 3 B 1 1 and 2 only C 2 and 3 only D 3 only

3 H2 Chemistry 9729/01 NYJC J2/2021 PRELIM. [Turn Over 5 What is the pressure (in Pa) of a sample of hydrogen gas that has density of 8 g m3 at 300 °C? A 5573 4 22.7 10 273 uu u B 573 8 22.7 100 273 uu u C 5273 8 22.7 10 573 uu u D 573 4 22.7 100 273 uu u 6 Given the following enthalpy changes, enthalpy change/ kJ mol1 N2(g) + 3H2(g) o 2NH3(g) –92 N2(g) + 4H2(g) + Cl2(g) o 2NH4Cl(s) –629 NH3(g) + HCl(g) o NH4Cl(s) –176 What is the standard enthalpy change of formation of gaseous hydrogen chloride? A –46.3 k