Iodide is an ion, not s a substance int its own right. It is however a component of many pure substances.
Iodine, the element from which the iodide ion is derived, is a pure substance.
Potassium iodide solution is a compound because it is a pure substance made up of potassium and iodine chemically bonded together in a fixed ratio.
This is an ionic compound and if it is not mixed in solution or found with other substances, it is pure.
Lithium iodide is a chemical compound, not a mixture.
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To a chemist, there are many kinds of salts. It would be more precise to say that sodium chloride is a pure substance. Table salt usually involves two different chemicals, mostly sodium chloride, but also some potassium iodide added as a nutritional supplement.
Pure substance
it is a pure substance.... not
Methane is a pure substance.
pure substance
pure substance
Pure Substance
Iodide is not a substance in its own right, it's an ion, though most of the substance it is found in are solids. Iodine, the element that this ion is derived from is also a solid.