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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
27 Nov 2021

Given information

The given pairs are as follows:

 

Step-by-step explanation

Step 1.

are atomic solids

These two form nonbonding atomic solids which are held together by weak dispersion forces. Hence these solids have very low melting points.

Since its an atomic solid, its melting point is determined by the strength of the intermolecular dispersion forces.

If the dispersion force is stronger more energy is required to break the force between the atoms in the solid and so the solids with stronger force between the atoms will have a higher melting point.

Dispersion force is affected by the size of the atom and molecular weight.

Among ,

is larger in size and has a higher molecular weight.

Thus has a stronger dispersion force than which is smaller in size.

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