Question

The technique used to separate carbon dioxide and water is :
a.) Distillation
b.) Membrane filtration
c.) Sublimation
d.) Chromatography

Answer 1

Hint: The carbon dioxide and water are present in mixture in fuel cells. A separation installation is used to separate the carbon dioxide from water and fuel. This separation installation is based on the principle of electro osmosis.

Complete answer:
One must wonder how carbon dioxide and water got mixed. The carbon dioxide and water mixture is found in fuel cells that even has a third component mixed with these which is fuel. In fuel cells, the water and fuel must be separated from carbon dioxide. So, we need a technique at that point. At that point, we have a separation installation. This separation installation works on the principle of electro osmosis. We know that osmosis has a semi-permeable membrane and the solvent moves from a region of lower concentration of solute to a region of higher concentration of solute.
Similarly, the separation installation has a membrane which is permeable to both fuel and water. Thus, the water and fuel pass through this and the carbon dioxide remains there. So, the carbon dioxide and water get separated.
Thus, it looks like membrane filtration.

So, the option b.) is the correct answer.

Note:
It must be noted that sublimation is the conversion of sublimation is the conversion of solid into direct gas. If we have carbon dioxide in solid form, then it can be sublimed also but this does not mention whether we have solid carbon dioxide or not.