Hydrates are formed with ionic compounds. Hence, option A is correct.
Hydrate is any compound containing water in the form of H2O molecules, usually, but not always, with a definite content of water by weight.
Hydrates form naturally when ionic compounds are exposed to air and make bonds with water molecules. Specifically, the bond is formed between the cation of the molecule and the water molecule. The water that remains is usually known as the water of hydration or water of crystallization.
Hence, option A is correct.
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