Which of the following statement is correct about homogeneous and heterogeneous mixtures?

1. The components of a mixture cannot be separated
2. The properties of a mixture are the same as those of its components
3. The properties of the mixtures may or may not be the same as those of its components
4. In a mixture the components are present in a fixed ratio

Answer (Detailed Solution Below)

Option 3 : The properties of the mixtures may or may not be the same as those of its components

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EXPLANATION:

•  Mixture: When two or more substances mix with each other without taking part in a chemical change, the resulting substance is called a Mixture. For example a solution of milk and water, seawater, crude oil, Ink, air etc.
• The mixer is two types: homogeneous mixer and heterogeneous mixer.

• The properties of the mixtures may or may not be the same as those of its components depending upon the type of the mixture.

• When two or more substances mix in fix ratio with each other after taking part in a chemical change, the resulting substance is called a compound.
• Their physical and chemical properties are the same at every molecule. For example water, CO2 etc.

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Which of the following statements is NOT correct about Heterogeneous mixtures?

1. Uniform composition
2. There are two or more phases present
3. Mixture of Sodium chloride and iron filings is a Heterogeneous mixture
4. It has a non-uniform composition

Answer (Detailed Solution Below)

Option 1 : Uniform composition

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The correct answer is Uniform composition.

Heterogeneous Mixture - 

• In a Heterogenous mixture, all the components are completely mixed and all the particles can be seen under a microscope.
• More than one phase is present.
• We can find a heterogeneous mixture by just seeing it.
• The mixtures can be separated physically.

Examples of Heterogeneous Mixtures

• Concrete is a heterogeneous mixture of an aggregate: cement, and water.
• Sugar and sand form a heterogeneous mixture. If you look closely, you can identify tiny sugar crystals and particles of sand.
• Ice cubes in cola form a heterogeneous mixture. The ice and soda are in two distinct phases of matter (solid and liquid). 
• Salt and pepper form a heterogeneous mixture.
• Chocolate chip cookies are a heterogeneous mixture. If you take a bite from a cookie, you may not get the same number of chips as you get in another bite.
• Soda is considered a heterogeneous mixture. It contains water, sugar, and carbon dioxide, which forms bubbles. While the sugar, water, and flavorings may form a chemical solution, the carbon dioxide bubbles are not uniformly distributed throughout the liquid.

Homogeneous Vs. Heterogeneous Mixtures

• In a homogeneous mixture, the components are present in the same proportion no matter where you take a sample.
• In contrast, samples taken from different parts of a heterogeneous mixture may contain different proportions of components.

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