Chapter 14, Problem 6A

Interpretation Introduction

Interpretation:

The reason for noble gases to be liquefied and solidified however, they could not give rise to dipole-dipole forces or hydrogen bonding needs to be explained.

Concept Introduction:

Noble gases are also called as Inert gases because they don’t react with anything.

Helium, Neon, Argon, Krypton, Xenon and Radon are the noble gas elements.

London Dispersion forces exist in Noble gases which increases with increase in surface area.

Answer to Problem 6A

Noble gases can be liquefied and solidified.

Explanation of Solution

Noble gases are monatomic and there is no permanent dipole moment. But one molecule in the sample of noble gas can induce dipole moment. This induced dipole moment can induce dipole in neighbouring molecule.

Noble gases can be liquefied. It is somehow difficult to liquefy noble gases as their atoms are held by weak Vander Waal's forces and they remain as liquid over only a small temperature range as their melting and boiling point differ by less than 10°C.

Liquefaction of gases can be brought about by complex process involving various compressions and expansions to achieve high pressure and very low temperature.

Down the group from He to Rn, the ease of liquefaction increases.

The noble gases can be solidified. For most of them, this can be done by cooling them. For helium, it is necessary to apply a pressure of approximately 25 atmospheres.