Question

Inert gas used in Brunauer – Emmet – Teller (BET) surface area analysis for measuring low surface area values is:

• A. \( {N}_2 \)
• B. \( {Ar} \)
• C. \( {Kr} \)
• D. \( {Xe} \)

Hint:

In BET surface area analysis, Krypton is often used when measuring low surface areas due to its suitable adsorption characteristics.

Answer 1

The Correct Option is C

The Brunauer-Emmet-Teller (BET) method is a widely used technique for determining the surface area of materials, particularly those with low surface areas. The method is based on gas adsorption, where an inert gas is adsorbed onto the surface of the material. The amount of gas adsorbed is used to determine the surface area.
For low surface area materials, the gas typically used in the BET analysis is Krypton (Kr). Krypton is preferred over nitrogen (\( {N}_2 \)) in situations where the surface area is very low because its adsorption properties are more suitable for such measurements. Other inert gases like Argon (\( {Ar} \)) and Xenon (\( {Xe} \)) are not commonly used in BET analysis for low surface area measurements.
Hence, the correct answer is: Krypton (Kr).