Which of the following gases is a noble gas?

Correct option is D

Correct Answer option (d): Argon
Explanation:
Noble gases are a group of elements in Group 18 of the periodic table. They are characterized by their inertness (low reactivity) due to having a complete outer shell of electrons. Argon is one such noble gas.

Other options:
A. Fluorine:
Fluorine is a halogen and belongs to Group 17 of the periodic table.
It is highly reactive, unlike noble gases.

B. Nitrogen:
Nitrogen is a diatomic gas (N₂) that belongs to Group 15.
It is not a noble gas, though it is relatively inert under normal conditions.

C. Oxygen:
Oxygen is a diatomic gas (O₂) that belongs to Group 16.
It is highly reactive and essential for combustion and respiration.

D. Argon:
Argon is a noble gas in Group 18.
It is inert and used in applications requiring a non-reactive environment, such as in welding and preserving historical documents.

Information booster:

Other Noble Gases:
Helium (He), Neon (Ne), Krypton (Kr), Xenon (Xe), Radon (Rn)

Properties of Noble Gases:
Low chemical reactivity.
Colorless, odorless, and tasteless.
Exist as monoatomic gases under normal conditions.