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Question

Which statement about substance classification is incorrect?


  1. A cake mixes may look like a pure substance, but it is not because it contains different types of particles such as flour, sugar and baking soda

  2. Milk is a pure substance because it is a solution of different molecules

  3. Pizza is a mechanical mixture because you see its components with your naked eye

  4. Solutions as well as pure substance can be described as homogenous


Solution

The correct option is B

Milk is a pure substance because it is a solution of different molecules


Milk is a colloid of liquid butter fat globules dispersed within a water- based solution. A colloid is a microscopically dispersed insoluble particles is suspended throughout another substance.

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