Multiple choice

Which of the following is a heterogeneous mixture?

  1. NaCl in water

  2. Iodine in CCl4

  3. Alcohol and water

  4. Sulphur in water
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D Correct answer
Explanation

Sulphur in water is a heterogeneous mixture because sulphur is insoluble in water - you can see yellow sulphur particles suspended in water, which will eventually settle at the bottom. The other options form homogeneous mixtures: NaCl dissolves completely in water, iodine dissolves in carbon tetrachloride, and alcohol mixes completely with water to form a uniform solution.

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