A metalloid used to make glassA) SulphurB) GermaniumC) SiliconD) Antimony

The correct answer is C) Silicon.

Explanation:
Metalloids are elements that have properties intermediate between metals and nonmetals. They are often used in various industrial applications due to their unique properties.

Silicon is a metalloid that is commonly used in the manufacture of glass. Here’s why:

Abundance and Availability: Silicon is the second most abundant element in the Earth's crust, primarily found as silica (SiO₂) in sand and quartz. This makes it easily accessible for industrial purposes.

Properties: Silicon has a combination of metallic and non-metallic properties. It is a good conductor of electricity under certain conditions, which makes it valuable in electronics. Its ability to form strong covalent bonds makes it useful in creating durable glass.

Use in Glass Production: In glassmaking, silicon dioxide (SiO₂) is the primary component. When heated, it forms a glassy, transparent material that is resistant to chemical reactions, thermal expansion, and is strong and durable.

Why the Other Options are Incorrect:
A) Sulphur: Sulphur is a non-metal, not a metalloid. While it has various uses (such as in the production of sulfuric acid, vulcanization of rubber, etc.), it is not used in the production of glass.

B) Germanium: Germanium is a metalloid, but its primary use is in semiconductors and infrared optics, not in glassmaking.

D) Antimony: Antimony is a metalloid, and it is used in some specialty glasses (e.g., as a fining agent to remove bubbles) but not commonly as the main component in glass manufacturing like silicon.

Therefore, Silicon (Option C) is the metalloid most commonly used to make glass.