The pure substances in the list are diamond and salt.
A pure substance is a substance that contains the same atom or group of atoms throughout the substance. Hence, diamond and salt are pure substances.
Diamond is composed of carbon atoms intricately linked to each other while water is composed of only hydrogen and oxygen atoms that constitute the water molecule.
Ocean water is not a pure substance because it contains a mixture of compounds. As such, we can not regard it as a pure substance.
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