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Which of the following is a chemical compound?
1. Oxygen
2. Air
3. Ammonia
4. Mercury

1 Answer

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Correct Answer - Option 3 : Ammonia

The Correct Answer is Ammonia.

  • Ammonia is a compound of nitrogen and hydrogen with the formula NH3. 
  • A stable binary hydride, and the simplest pnictogen hydride, ammonia is a colorless gas with a distinct characteristic of a pungent smell. 

  • Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the Chalcogen group in the periodic table, a highly reactive non-metal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. 
  • Air is a mixture of a variety of gasses. The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapor, and small amounts of other elements (argon, Krypton, neon, etc).
  • Mercury is a chemical element with the symbol Hg and atomic number 80. It is commonly known as quicksilver and was formerly named Hydrargyrum.

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