The "intermolecular" forces exist between copper sulfate and water is ion - dipole interaction.
Intermolecular forces refers to the force of attraction that holds particles of the same or different substances together. Copper sulfate is an ionic substance and water is a polar substance.
When dissolved in water, copper sulfate breaks up into ions which are capable of interacting with water via ion - dipole interactions. Hence, the "intermolecular" forces exist between copper sulfate and water is ion - dipole interaction.
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