Which of the following substances does not dissolve in water?
a. sugar
b. pepper
C. oil
d. milk powder
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Answer:
Pepper and oil do not dissolve in water.
Explanation:
Sugar and milk dissolve in water, but pepper and oil cannot.
Pepper and oil are hydrophobic, instead of getting attracted to water, they get repelled by them.
Pepper:
Peppers cling to each other and create tension on the water's top layer.
This leads them to float on the water surface.
Oil:
The molecules of water are polar molecules, i.e. they are positively charged at one end and negatively charged at the other end whereas oil molecules do not have polar parts.
Due to this, they tend to stay away from the water molecules. Therefore, oil and water don’t mix together.
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