Multiple choice

Which of the following substances falls under the category of mixtures?

  1. Milk

  2. Ice

  3. Iron

  4. Calcium oxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Milk is a colloid mixture of water, fats (butterfat), proteins (casein), and sugars (lactose) that cannot be separated by simple filtration. Ice is pure H₂O, iron is a single element, and calcium oxide (CaO) is a pure compound; none are mixtures.

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