Question

Which among the following halogen exists in liquid state at room temperature?

• A. Fluorine
• B. Chlorine
• C. Bromine
• D. Iodine

Answer 1

The Correct Option is C

In the context of halogens, the physical state at room temperature is determined by intermolecular forces and molecular weight. At room temperature, some halogens are gases, one is a liquid, and one is a solid. Here's a brief explanation:

• Fluorine (F₂): A pale yellow gas at room temperature.
• Chlorine (Cl₂): A greenish-yellow gas at room temperature.
• Bromine (Br₂): A dark red-brown liquid at room temperature, due to its relatively larger atomic size and stronger van der Waals forces compared to fluorine and chlorine, making it the only liquid halogen under these conditions.
• Iodine (I₂): A dark purple solid at room temperature.

Therefore, Bromine is the halogen that exists in a liquid state at room temperature.

Answer 2

Fluorine (F) and Chlorine (Cl) are gases at room temperature due to their low boiling points.
Iodine (I) is a solid at room temperature with a higher boiling point than bromine, so it doesn't exist as a liquid under normal conditions.
Bromine (Br), however, exists as a liquid at room temperature (around 25°C), as its boiling point is 58.8°C and its melting point is -7.2°C.

Thus, Bromine is the halogen that exists in the liquid state at room temperature.