Which glass is low thermal resistance and suitable for strong acids and alkali?

• A. Soft glass
• B. Flint glass
• C. High silica glass
• D. Borosilicate glass

Answer: (A)

Thermal stability and chemical compatibility of glass types are what this item is testing. Soft glass has the lowest resistance to thermal shock among common laboratory glasses, meaning it heats and cools more readily, so rapid temperature changes can cause cracking or breakage. That low thermal resistance is a defining trait of soft glass. At the same time, in typical lab use it remains compatible with many aqueous reagents, including strong acids and alkalis, which is why it’s described as suitable for those solutions in this context. By contrast, flint glass, high silica glass, and borosilicate glass are known for better thermal stability and greater chemical durability, especially under more demanding conditions.