Question

Which among the following metals is liquid at room temperature ?

• A. Mercury
• B. Iron
• C. Copper
• D. Alluminium

Hint:

Only one metal has a melting point below room temperature. It was used in old thermometers.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
We need the metal that is a liquid at room temperature, about 25 degrees Celsius.

Step 2: Key Concept:
Most metals have high melting points and are solid. Mercury is the well-known exception. Its melting point is about minus 39 degrees Celsius, so it stays liquid at room temperature.

Step 3: Check option 1:
Mercury is liquid at room temperature. So option 1 is right.

Step 4: Check option 2:
Iron melts at about 1538 degrees Celsius, so it is solid. Option 2 is wrong.

Step 5: Check option 3:
Copper melts at about 1085 degrees Celsius, so it is solid. Option 3 is wrong.

Step 6: Check option 4:
Aluminium melts at about 660 degrees Celsius, so it is solid. Option 4 is wrong.

Final Answer:
Mercury is the metal that is liquid at room temperature, option 1. \[ \boxed{\text{Option 1}} \]