Which of the Following Materials Fall in the Category of a Pure Substance? (a) Ice (B) Milk (C) Iron (D) Hydrochloric Acid (E) Calcium Oxide (F) Mercury (G) Brick (H) Wood (I)air

From the given materials, ice, iron, hydrochloric acid, calcium oxide and mercury falls in the pure substance category. Milk is a colloidal solution, air and brick are mixtures as they are made of more than one substance.

Pure substances:

1. Elements or compounds are examples of “pure substances.”
2. No physical technique can separate a substance.
3. A pure substance’s composition and qualities are fixed.
4. Examples of substances include iron and sugar.

Properties of substance:

• One condition of matter makes up a pure material.
• It has a known mass, weight, and volume.
• It is made up of molecules and/or atoms.

Out of the possibilities provided, ice, iron, hydrochloric acid, calcium oxide, and mercury are the substances that fall within the category of pure substances. whereas a colloidal solution is milk. Brick and air are both called mixes because they include multiple different substances.