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Q: Which one of the following is not a compound?
  • A. Carbon monoxide
  • B. Iron
  • C. Sodium chloride
  • D. Water
Correct Answer: Option B - The pure substances that are chemically formed by chemical combination of two or more elements in a certain ratio are called compound. Example- Carbon monoxide, sodium chloride, water etc. Wheras Iron is an element.
B. The pure substances that are chemically formed by chemical combination of two or more elements in a certain ratio are called compound. Example- Carbon monoxide, sodium chloride, water etc. Wheras Iron is an element.

Explanations:

The pure substances that are chemically formed by chemical combination of two or more elements in a certain ratio are called compound. Example- Carbon monoxide, sodium chloride, water etc. Wheras Iron is an element.