2021 ACSI Prelims Paper 1

1 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2021 [Turn over Anglo-Chinese School (Independent) Year 4 Express Preliminary Examination 2021 CHEMISTRY PAPER 1 Multiple Choice 6092/1 Tuesday 17th August 2021 1 hour Additional materials: Calculator Multiple Choice answer sheet Soft clean eraser Soft pencil (type 2B recommended) INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write and shade the candidate number on the answer sheet in the spaces provided. There are forty 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. INFORMATION FOR CANDIDATES 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. You may use a calculator. A copy of the Periodic Table is printed on page 16. This question paper consists of 16 printed pages.

2 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2021 [Turn over 1 The boiling points of various gases found in a gas sample are shown below. gas boiling point / oC argon - 186 oxygen - 183 nitrogen - 198 Which gas(es) will remain gas(es) in the gas sample at – 185oC? A nitrogen only B oxygen only C argon and nitrogen only D oxygen and nitrogen only 2 Which of the following apparatus will be most suitable to measure accurately 14.8 cm 3 of dilute nitric acid? A B C D

3 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2021 [Turn over 3 When a beaker full of ethene is inverted over a porous pot containing carbon monoxide as shown in the diagram below, the water level does not move. This is because both gases ________________________________. A are carbon compounds B are miscible C do not dissolve in water D have the same relative molecular mass 4 A mobile phone with a stainless steel casing contains the neurotoxin mercury and the carcinogen gallium arsenide. Which row correctly classifies the materials found in the phone casing? element mixture compound A mercury gallium arsenide stainless steel B mercury stainless steel gallium arsenide C stainless steel gallium arsenide mercury D stainless steel mercury gallium arsenide water beaker ethene carbon monoxide porous pot

4 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2021 [Turn over 5 The nucleon number of an ion X3+ is 27 and it has 10 electrons. What does the nucleus of the ion X3+ contains? number of protons number of neutr