Which of the following is the only metal that exists in liquid state at room temperature?

Mercury

The correct answer is option 3. Mercury

Metals usually show some or all of the following properties:

• They have a lustre (shine).

• They have silvery-grey or golden-yellow colour.

• They conduct heat and electricity.

• They are ductile (can be drawn into wires).

• They are malleable (can be hammered into thin sheets).

• They are sonorous (make a ringing sound when hit).

Examples of metals are gold, silver, copper, iron, sodium, potassium, etc.

Mercury is the only metal that is liquid at room temperature.