The freezing of water into ice and the dehydration of copper sulfate are both reversible. The correct options are C and D.
What are reversible reactions?
They are reactions in which the reverse can occur.
The freezing of water into ice can be undone. That is, the ice can be thawed back to water.
The dehydration of copper sulfate involves the removal of water molecules. As soon as water becomes available again, the reaction is reversed.
More on reversible reactions can be found here: https://brainly.com/question/16614705
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