Which one among the following substances is a compound?

  1. A. Sugar
  2. B. Air
  3. C. Milk
  4. D. Tea

Correct Answer: A. Sugar

Explanation

Sugar is a chemical compound (e.g., sucrose, C_{12}H_{22}O_{11}), formed by chemically combining carbon, hydrogen, and oxygen. Air, milk, and tea are physical mixtures.

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