Chemistry MCQS

411. Noble gases are often used in neonatal incubators because they are:
a) Highly reactive
b) Non-toxic
c) Radioactive
d) Highly flammable

412. Which of the following noble gases is used in some types of anesthesia?
a) Helium
b) Neon
c) Argon
d) Xenon

413. The term “noble gas” comes from the Latin word “nobilis,” which means:
a) Radioactive
b) Inert
c) Reactive
d) Toxic

414. Noble gases are often used in neon signs because they emit light when:
a) Heated
b) Exposed to air
c) Exposed to water
d) An electric current is passed through them

415. Which noble gas is used in some types of arc welding?
a) Helium
b) Neon
c) Argon
d) Krypton

416. Which of the following noble gases is used in some types of lasers for medical applications?
a) Helium
b) Neon
c) Argon
d) Xenon

417. The noble gases were the last group of elements to be discovered because of their:
a) High reactivity
b) Low abundance in nature
c) Radioactivity
d) High melting points

418. Which noble gas is used in some types of lighting due to its ability to produce a bright white light?
a) Helium
b) Neon
c) Argon
d) Xenon

419. Noble gases are used in double-glazed windows to improve:
a) Thermal insulation
b) Sound insulation
c) Ultraviolet protection
d) Light transmission

420. When a molecule loses or gains an electron, it forms a?
A) Molecular ion
(B) Cation
(C) Ion
(D) None of the above