Question

Which of these liquefied metal expanding on solidification_________.

• A. Zinc
• B. Gallium
• C. Chlorine
• D. Aluminum

Answer 1

The correct option is B

Gallium

Explanation for correct option:

B. Gallium

• Gallium $\left(\mathrm{Ga}\right)$ is soft as well as silvery metal.
• It is solid at room temperature ${25}^{\mathrm{o}}\mathrm{C}$ but can be easily cut with a knife.
• Its melting point is ${30}^{\mathrm{o}}\mathrm{C}$. This metal expands by $3\%$ when it solidifies and due to this reason it should not be stored in glass as well as metallic containers.

Explanation for incorrect options:

A. Zinc is a solid metal at room temperature ${25}^{\mathrm{o}}\mathrm{C}$ and it is not a liquefiable metal.

C. Chlorine is a non-metal which exists as a gas.

D. Aluminium is a solid metal at room temperature ${25}^{\mathrm{o}}\mathrm{C}$ and it is non-liquefiable metal.

Hence, the correct option is B i.e. Gallium.