Question

A metal which can be cut with a knife is:

• A. Ga
• B. Pt
• C. Pb
• D. Mg

Hint:

Gallium's softness and low melting point make it useful in electronic and semiconductor applications. However, due to its tendency to damage aluminum, it is used cautiously in certain environments.

Answer 1

The Correct Option is A

The metal that can be cut with a knife is Gallium (Ga). Gallium is a soft metal with a low melting point of about 29.76°C, making it easily malleable at room temperature. Unlike harder metals such as Platinum (Pt), Lead (Pb), or Magnesium (Mg), Gallium can be cut with a knife because of its soft and brittle nature.
- Gallium is a poor conductor of electricity but is highly corrosive to other metals like aluminum, especially at higher temperatures.
- Its low melting point and softness are the primary reasons it can be cut with a knife.
The other metals listed, such as platinum (Pt), lead (Pb), and magnesium (Mg), are much harder and cannot be cut with a knife under normal conditions.