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Question

Which of the following statement is false regarding mixtures?
  1. Salads are heterogeneous mixtures
  2. NaCl(aq) is a homogeneous mixture
  3. Milk is a homogeneous mixture
  4. Pure iron is a heterogeneous mixture
  5. Sand and water make a heterogeneous mixture

A
Salads are heterogeneous mixtures
B
Sand and water make a heterogeneous mixture
C
Pure iron is a heterogeneous mixture
D
NaCl(aq) is a homogeneous mixture
E
Milk is a homogeneous mixture
Solution
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A homogeneous mixture has the same uniform appearance and composition throughout.

A heterogeneous mixture consists of visibly different substances or phases. A salad with lettuce, cheese, seeds, tomatoes, broccoli, and other vegetables is an example of a heterogeneous mixture.

NaCl(aq) solution and milk is a homogeneous mixture that has a uniform composition throughout.

Sand and water make a heterogeneous mixture as sand is insoluble in water and the mixture has localized regions with different properties.

Pure iron is not at all a mixture. It is a pure form of an element and can not be classified as a homogeneous or heterogeneous mixture.

Hence, option E represents a false statement regarding mixtures.

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