Question : Which one of the following is not a compound?
Option 1: Sodium Chloride
Option 2: Carbon Monoxide
Option 3: Iron
Option 4: Water
Correct Answer: Iron
Solution : The correct answer is Iron.
Pure iron is not a compound. Since iron is made up of just one kind of atom, Fe, it is classified as an element. A material must have two or more chemically bonded elements to be classified as a compound. Sodium chloride: NaCl, Carbon monoxide: CO, Water: H 2 O. These compounds consist of sodium and chlorine, carbon and oxygen and hydrogen and oxygen, respectively.
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