Question

Which of the following is liquid at ordinary temperature?

• A. Germanium
• B. Gallium
• C. Gold
• D. Galena

Hint:

Gallium has a very low melting point and can melt in the palm of your hand, making it unique among metals.

Answer 1

The Correct Option is B

Step 1: Recall the melting points of the given substances.

Germanium: Melting point \(\approx 938^\circ\text{C}\) — solid at ordinary temperature
Gallium: Melting point \(\approx 29.7^\circ\text{C}\) — melts near room temperature
Gold: Melting point \(\approx 1064^\circ\text{C}\) — solid
Galena (PbS): High melting point — solid
Step 2: Identify the substance liquid at ordinary temperature. Since gallium melts slightly above room temperature, it can exist as a liquid at ordinary conditions. Step 3: Final conclusion. The substance that is liquid at ordinary temperature is \(\boxed{\text{Gallium}}\).