Answer:
A) increasing dispersion interactions
Explanation:
Polarizability allows gases containing atoms or nonpolar molecules (for example, to condense. In these gases, the most important kind of interaction produces dispersion forces, attractive forces that arise as a result of temporary dipoles induced in atoms or molecules.
Dispersion forces, which are also called London forces, usually increase with molar mass because molecules with larger molar mass tend to have more electrons, and dispersion forces increase in strength with the number of electrons. Furthermore, larger molar mass often means a bigger atom whose electron distribution is more easily disturbed because the outer electrons are less tightly held by the nuclei.
Because the noble gases are all nonpolar molecules, the only attractive intermolecular forces present are the dispersion forces.
The boiling point of the noble gas increases on moving down the group because of the increase in the dispersion force. Thus, option A is correct.
The noble gas has been consisted of the fully complete octet of the atom and has been less reactive in nature.
On moving down the group, there has been an increase in the number of shells of the atom with the increase in the atomic mass. The bigger molecules tend to have loosely bonded outermost electrons.
In noble gases, the force acting upon the molecule has been the Dispersion force. Since, the noble gas has a complete octet, the energy for removing the electrons and changing the state increase with the increase in the molecular mass.
The only force acting on the noble gases has been the dispersion force, Thus with an increase in the dispersion force, the boiling point increases. Thus, option A is correct.
For more information about the boiling point of the noble gases, refer to the link:
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