Multiple choice

Which of the following is a Compound

  1. Air

  2. Ammonia

  3. Mercury

  4. Ozone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ammonia (NH3) is a compound composed of two different elements (nitrogen and hydrogen) chemically bonded in a fixed ratio. Air is a mixture of gases, Mercury is a pure element, and Ozone (O3) is a molecule of the same element. A compound must contain at least two different elements.

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