Homework Answers
Inceasing order :
He < OF2 < HF < CaF2
Reason:
He has only weak lodon forces of attractions among its atoms.
OF2 has dipole - dipole interactions inaddition to lodon forces.
HF has strong intermolecular hydrogen bonding inaddition to dipole - dipole and lodon forces.
CaF2 has strongest electrostatic force of attraction ( ionic bond) between Ca2+ and F- ions.
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