CIE iGCSE Co-Ordinated Science C8.5 Noble gases Exam Style Questions Paper 2
▶️ Answer/Explanation
Argon is an unreactive noble gas, so it does not react with the hot filament inside a light bulb.
It is used to fill lamps to provide an inert atmosphere, preventing the filament from oxidising and burning out quickly.
Argon is not used as a catalyst, in metal alloys, or to neutralise chemical waste, as these all require reactive properties argon lacks.
✅ Answer: (C)
It is used to fill lamps to provide an inert atmosphere, preventing the filament from oxidising and burning out quickly.
Argon is not used as a catalyst, in metal alloys, or to neutralise chemical waste, as these all require reactive properties argon lacks.
✅ Answer: (C)
▶️ Answer/Explanation
Argon is used to fill lamps because it is unreactive and will not react with the hot filament.
An unreactive gas prevents the filament from oxidising and burning out quickly.
✅ Answer: (D)
An unreactive gas prevents the filament from oxidising and burning out quickly.
✅ Answer: (D)
▶️ Answer/Explanation
Argon is a noble gas with a full outer shell of electrons, making it chemically unreactive.
This unreactivity means it does not react with the hot filament in a lamp, preventing it from burning out quickly.
✅ Answer: (D)
This unreactivity means it does not react with the hot filament in a lamp, preventing it from burning out quickly.
✅ Answer: (D)
▶️ Answer/Explanation
Group VIII noble gases have a full outer shell of electrons.
This stable electron arrangement means they have no tendency to gain, lose or share electrons, so they do not readily react.
Being gaseous or monatomic is a physical description, not the reason for their unreactivity.
✅ Answer: (D)
This stable electron arrangement means they have no tendency to gain, lose or share electrons, so they do not readily react.
Being gaseous or monatomic is a physical description, not the reason for their unreactivity.
✅ Answer: (D)
▶️ Answer/Explanation
Filament lamps need an unreactive (inert) gas so that the hot metal filament does not react with it and burn out or oxidise.
Argon is a noble gas and is chemically inert, making it ideal for this purpose, and it is also cheap and readily available from the air.
Hydrogen and oxygen are reactive gases (hydrogen is flammable, oxygen supports combustion), so they would be unsuitable, while helium, although inert, is not the gas conventionally used in filament lamps.
✅ Answer: (A)
Argon is a noble gas and is chemically inert, making it ideal for this purpose, and it is also cheap and readily available from the air.
Hydrogen and oxygen are reactive gases (hydrogen is flammable, oxygen supports combustion), so they would be unsuitable, while helium, although inert, is not the gas conventionally used in filament lamps.
✅ Answer: (A)