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: H2O. These compounds consist of sodium and chlorine, carbon and oxygen and hydrogen and oxygen, respectively.
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Question : Which of the following is not a food preservative?
Option 1: Aqua regia
Option 2: Vinegar
Option 3: Sodium chloride
Option 4: Sodium nitrite
Question : Which of the following gases is used in a bulb?
Option 1: Hydrogen
Option 2: Carbon dioxide
Option 3: Carbon monoxide
Option 4: Argon
Question : Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?
Option 1: Helium
Option 2: Nitrogen
Option 3: Oxygen
Option 4: Hydrogen
Question : Which of the following is the main compound of voter ink?
Option 1: Silver nitrate
Option 2: Ammonium chloride
Option 3: Silver chloride
Option 4: Ammonium nitrate
Question : Saltpetre is another name for ______.
Option 1: sodium chloride
Option 2: potassium nitrate
Option 3: potassium chloride
Option 4: sodium hydroxide
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