which gas is not obtained on a large scale by fractional distilation

argon

Argon

Not according to Google.

https://nzic.org.nz/app/uploads/2017/10/1K.pdf

Argon

I apologize for the confusion. The correct answer is actually neon. Neon occurs in the air at a concentration of only 18.18 ppm (parts per million) and is typically obtained through cryogenic distillation.

To determine which gas is not obtained on a large scale by fractional distillation, we need to understand the process of fractional distillation and the types of gases that can be obtained from it.

Fractional distillation is a method used to separate a mixture of two or more liquids with different boiling points. It involves heating the mixture and collecting the individual components as they vaporize at their specific boiling points.

Most commonly, fractional distillation is used to separate crude oil into various fractions such as gasoline, diesel, kerosene, and others. These fractions are obtained in large quantities by this method.

However, there are certain gases that cannot be obtained on a large scale by fractional distillation. This is primarily because these gases exist as either noble gases or lighter-than-air gases that are present in the atmosphere in relatively low concentrations.

Examples of gases that are not obtained on a large scale by fractional distillation include:

1. Noble Gases: Noble gases, such as helium (He), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe), have very low boiling points and are obtained from the atmosphere by methods like air liquefaction and fractional distillation of liquefied air. However, due to their relatively low abundance in the atmosphere and specific applications, they are not produced on a large scale by fractional distillation.

2. Hydrogen (H2): Hydrogen gas is the lightest gas and has a very low boiling point. It is usually obtained by various methods like steam reforming of natural gas or electrolysis of water. While fractional distillation can separate hydrogen from other gases, it is not typically used on a large scale for this purpose.

In summary, gases such as noble gases (helium, neon, argon, krypton, xenon) and hydrogen are not obtained on a large scale by fractional distillation. Other methods specific to these gases are employed for their production.