What is the name of the metal which exists in liquid state at room temperature?(A) Sodium (B) Potassium (C) Mercury (D) Bromine

1. Break Down the Problem

Identify the metals listed in the options and determine which one can exist in a liquid state at room temperature.

2. Relevant Concepts

• Metals: Usually solid at room temperature, with the exception of certain metals that may take on a liquid form under specific conditions.
• Melting Point: The temperature at which a solid becomes a liquid.

3. Analysis and Detail

• (A) Sodium: Melting point of about 98°C, solid at room temperature.
• (B) Potassium: Melting point of about 63.5°C, solid at room temperature.
• (C) Mercury: Melting point of about -38.83°C, exists as a liquid at room temperature.
• (D) Bromine: Not a metal, but it is a liquid at room temperature; however, it is a halogen.

4. Verify and Summarize

The only option that is a metal and exists in a liquid state at room temperature is Mercury.

Final Answer

The metal which exists in liquid state at room temperature is (C) Mercury.