B. Heterogeneous mixtures
Explanation:
Heterogeneous mixtures are the class of matter that are the least evenly mixed form the given option.
A heterogeneous mixture is made up of matters in more than one phase.
Homogeneous mixtures have matter in just one single phase.
A solution is a homogeneous mixture of solutes and solvents.
A compound is distinct substance formed by the combination of two or more elements.
- A heterogeneous mixture is not uniform in all its parts.
- Gas- liquid mixtures e.g aerated drinks like beer and soft drinks
- liquid - solid mixtures like muddy water
- Gas-solid mixtures like smoke
- These are all heterogeneous mixtures.
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Water Solution
Because you are testing the water solutions pH