Which of the following is not a mixture?

Correct option is A

The correct answer is (a) Distilled water

Explanation:
• Distilled water is pure water that has been purified through the process of distillation, where impurities and dissolved substances like minerals are removed.
• It is not a mixture but a pure substance, consisting solely of H₂O molecules.
• In contrast, other options like air, milkshake, and iodized salt are mixtures that consist of two or more substances physically combined.

Information Booster:
• Distilled water is often used in laboratories and for applications requiring pure water without impurities.
• Since it is free from any dissolved solids or other chemicals, it qualifies as a pure substance, not a mixture.

Additional Knowledge:
Air (Option b)
• Air is a mixture of various gases such as nitrogen, oxygen, carbon dioxide, and trace gases.
• It is a homogeneous mixture, meaning the components are uniformly distributed.

Milkshake (Option c)
• A milkshake is a heterogeneous mixture of milk, ice cream, and flavorings, where the components do not chemically bond together but are physically combined.

Iodized Salt (Option d)
• Iodized salt is a mixture of sodium chloride and a small amount of iodine. The iodine is added to prevent iodine deficiency, but it does not chemically bond with the salt, making it a mixture.