Argon is used in gas filled electric lamps because ____________
A. it is radioactive B. it has low pressure C. is combustible D. it helps to prevent oxidation
Correct Answer: D
Explanation
Noble gases are quite useful. Helium is used in filling balloon. Neon is used in many advertisement as it glows red when electrical discharge is passed through it. Argon is used in gas-filled electric lamp since it retards the combustion of the filament. A mixture of krypton and xenon is used in photographer's flash tube for taking high speed pictures. Radon, being a radioactive one, is useful in curing cancer.