Question

The four tyres of a motor car are filled with $C{O_2}$ , $He$ , ${H_2}$ and ${O_2}$ respectively. The order in which they are to be re-inflated is?
A.$C{O_2}$ , ${O_2}$ , $He$ , ${H_2}$
B.${H_2}$ , $He$ , ${O_2}$ , $C{O_2}$
C.${H_2}$ , $He$ , $C{O_2}$ , ${O_2}$
D.${H_2}$ , ${O_2}$ , $He$ , $C{O_2}$

Answer 1

Hint: This question gives the knowledge about the diffusion of gases. The term diffusion is defined as the flow of constituents or particles from the region of high concentration to the region of low concentration. Diffusion is a process which is very important for living things.

Complete Answer:
The term diffusion is defined as the flow of constituents or particles from the region of higher concentration to the region of lower concentration. Diffusion generally takes place in gases and liquids because the gaseous particles or the liquid particles are free to move from one place to another very easily as they are not bound together by any strong intermolecular forces. Also, diffusion is a process which is very important for living things.
Concentration gradient is the main component for the diffusion to take place. It is directly proportional to the rate of diffusion of gases. Another important component for diffusion is the molecular weight of chemical compounds. It is inversely proportional to the rate of diffusion of gases.
Molecular weight is defined as the total sum of masses of all the atoms present in the molecular compound.
The four tyres of a car are filled with $C{O_2}$ , $He$ , ${H_2}$ and ${O_2}$ gas. The rate of re-inflation is determined on the basis of molecular weight of these gases. As we know, the molecular weight is inversely proportional to the rate of diffusion of gases. So, higher the molecular weight, lesser is the re-inflation.
The order of molecular weight is as follows:
${H_2} < He < {O_2} < C{O_2}$
Hence, the order for re-inflation will be as follows:
${H_2} > He > {O_2} > C{O_2}$

Therefore, option A is correct.

Note: This is how the diffusion takes place , the relation between the rate of diffusion of gases and the molecular weight. Diffusion is a process which is very important for living things and Molecular weight is defined as the total sum of masses of all the atoms present in the molecular compound.