Essential HKDSE Chemistry MCQs: Planet Earth Insights
School
University of Florida**We aren't endorsed by this school
Course
AS 94A
Subject
Chemistry
Date
Dec 12, 2024
Pages
4
Uploaded by MateRedPanda1389
HKDSE NEW CHEMISTRY —A Modern View Question Bank Part I Planet Earth Multiple-choice questions © 2022 Aristo Educational Press Ltd. Chapter 1Chapter 1 Introduction to Chemistry Sections 1.11.5 ChemMCQ01001 Which of the following combinations is INCORRECT? Hazard warning label Meaning A. Corrosive B. Flammable C. Explosive D. Toxic Answer: B The label in (B) means oxidizing. ChemMCQ01002 Which of the following hazard warning labels should be displayed on a bottle of sodium hydroxide pellets? (1) (2) (3) A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only
HKDSE NEW CHEMISTRY —A Modern View Question Bank Part I Planet Earth Multiple-choice questions © 2022 Aristo Educational Press Ltd. Chapter 1Answer: A Sodium hydroxide pellets are corrosive. ChemMCQ01003 The following hazard warning labels are found on a reagent bottle of a chemical. Which of the following statements concerning the chemical is correct? A. It is oxidizing and irritant. B. It is oxidizing and harmful. C. It is flammable and harmful. D. It is flammable and irritant. Answer: C ChemMCQ01004 When a mixture is heated, a toxic gas is produced. Which of the following safety precautions should be taken in the experiment? (1) Carry out the experiment in the fume cupboard. (2) Ensure good ventilation in the laboratory. (3) Use a water bath to heat the mixture instead of heating it directly. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) Answer: A ChemMCQ01005 Which of the following should NOT be attempted in the school laboratory? (1) Smell ammonia gas by breathing directly above a test tube. (2) Heat a test tube containing some ethanol with a Bunsen burner. (3) Take out a piece of sodium metal from the reagent bottle with bare hands. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only
HKDSE NEW CHEMISTRY —A Modern View Question Bank Part I Planet Earth Multiple-choice questions © 2022 Aristo Educational Press Ltd. Chapter 1D. (1), (2) and (3) Answer: D (1): To smell ammonia gas, one should hold the test tube away from the nose and then ‘fan’ a little of the gas towards the nose.(2): As ethanol is flammable, ethanol should be heated with a water bath. (3): As sodium is corrosive, sodium metal should be handled with a pair of forceps. Section 1.6 ChemMCQ01006 Hydrogen can be collected using the set-up shown in the diagram below. Which of the following properties of hydrogen can explain why hydrogen can be collected using the above set-up? A. Hydrogen is less dense than air. B. Hydrogen is flammable. C. Hydrogen is insoluble in water. D. Hydrogen burns with a ‘pop’sound. Answer: C ChemMCQ01007 Which of the following methods is NOT suitable for collecting methane? A. Upward displacement of air B. Upward delivery C. Displacement of water D. Using a gas syringe Answer: A Methane is insoluble in water and less dense than air. Upward displacement of air is suitable for collecting gases that are denser than air. ChemMCQ01008 water
HKDSE NEW CHEMISTRY —A Modern View Question Bank Part I Planet Earth Multiple-choice questions © 2022 Aristo Educational Press Ltd. Chapter 1A microscale experiment is performed to generate chlorine gas by the reaction of dilute hydrochloric acid with chlorine bleach. Which of the following statements concerning the microscale experiment is INCORRECT? A. The volume of dilute hydrochloric acid used is reduced. B. Less chemical wastes are produced. C. The experiment can be completed in a shorter period of time. D. The chlorine gas produced will be less toxic. Answer: D