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- 1. Multiple Choice
Which of the following hazard warning labels should be shown on a gas jar containing oxygen?
- 2. Multiple Choice
Which of the following combinations is correct?
- 3. Multiple Choice
Which of the following correctly describes the flame colour produced by the substance in the flame test?
- 4. Multiple Choice
Which of the following statements concerning the fractional distillation of liquid air is correct?
A. In the process, the components of air are separated according to their difference in densities.
B. Nitrogen is boiled off first because it has the lowest boiling point.
C. In the process of purification of air, the filtered air is cooled to –80°C to remove carbon dioxide and oxygen.
D. In the process of liquefaction of air, the purified air is compressed and cooled repeatedly to reach –100°C.
- 5. Multiple Choice
Which of the following diagrams correctly represents the arrangement of particles in a mixture of an element and a compound?
- 6. Multiple Choice
A gas does not relight a glowing splint, and it has a boiling point of –196°C. What is the gas?
A. Oxygen
B. Water vapour
C. Nitrogen
D. Carbon dioxide
- 7. Multiple Choice
The set-up for the electrolysis of sea water is shown.
What hazard warning labels should be shown on the gas jars containing gases X and Y respectively?
- 8. Multiple Choice
Which of the following statements concerning nitrogen is correct?
A. It supports burning.
B. It is used to make fertilizers.
C. It is used to fill light bulbs.
D. It boils at –183°C.
- 9. Multiple Choice
Which of the following correctly describes the sequence of steps used to obtain crystals of common salt from a mixture of mud and sea water?
A. Distillation, crystallization
B. Crystallization, filtration
C. Filtration, distillation
D. Filtration, crystallization
- 10. Multiple Choice
Which of the following processes does NOT produce carbon dioxide?
A. Adding water to quicklime
B. Putting clam shells into dilute hydrochloric acid
C. Extraction of lead from lead(II) oxide by carbon reduction
D. Heating marble strongly
- 11. Multiple Choice
An experimental set-up is shown.
Which of the following combinations is correct?
- 12. Multiple Choice
An aqueous solution is tested and the results are shown.
Which of the following may be found in the aqueous solution?
A. Potassium carbonate
B. Potassium chloride
C. Magnesium chloride
D. Potassium carbonate and magnesium chloride
- 13. Multiple Choice
When calcium carbonate is heated strongly, solid P and gas Q are produced. Which of the following combinations about the properties of P and Q is correct?
- 14. Multiple Choice
Which of the following would be observed when a piece of charcoal is burnt in air?
(1) A yellow flame is seen.
(2) A gas is given out.
(3) The piece of charcoal becomes white.
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
- 15. Multiple Choice
Which of the following is/are the uses of hydrogen obtained from the chloroalkali industry?
(1) To make soaps
(2) To make margarine
(3) To make ammonia
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
- 16. Multiple Choice
Which of the following processes will show a colour change?
(1) Adding water to sodium chloride solution
(2) Adding water to dry cobalt(II) chloride paper
(3) Adding zinc to dilute hydrochloric acid
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
- 17. Multiple Choice
Some properties of element X are listed as follows. Which of the properties are chemical properties?
(1) It conducts electricity.
(2) It gives a colourless gas when it is added to water.
(3) It burns with oxygen.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
- 18. Multiple Choice
Which of the following methods can be used to distinguish between potassium carbonate and copper(II) chloride?
(1) Flame test
(2) Silver nitrate test
(3) Addition of dilute hydrochloric acid
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
- 19. Multiple Choice
Which of the following are the advantages of performing microscale experiments?
(1) Reducing the amount of chemicals used
(2) Reducing the amount of chemical waste
(3) More accurate experimental results
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
- 20. Multiple Choice
Which of the following statements about iron(II) sulphide are correct?
(1) It is a mixture of iron and sulphur.
(2) It is not attracted by magnet.
(3) It reacts with dilute hydrochloric acid and gives a gas with a smell of bad eggs.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
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