Which give toughness to glass

Solution (By Examveda Team)

In the production of glass, different materials are added to improve its properties, including toughness, strength, and durability.

Cullet is a term used to describe crushed recycled glass. It is added to the glass-making process to improve the melting efficiency and reduce energy consumption. However, it does not directly contribute to toughness.

Lime (calcium oxide) is a key ingredient in glassmaking. It helps to stabilize the silica network in the glass and contributes to its overall strength. However, lime is not the primary factor for enhancing toughness.

Potash (potassium carbonate) is used in glass production to lower the melting point of the raw materials and improve the working properties of the glass. It does not significantly contribute to toughness.

Soda (sodium carbonate) is another important ingredient in glass production. It helps to lower the melting point of the raw materials. While soda contributes to the glass's workability and durability, it is not primarily responsible for toughness.

Conclusion:
The material that primarily contributes to the toughness of glass is lime, as it helps to create a stable glass structure that resists breaking under stress.

Therefore, the correct answer is: Option B: Lime.