Tag: classification of mixtures

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Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Identify the mixture from the following:

  1. Oxygen

  2. Carbon dioxide

  3. Hydrogen

  4. Air
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The mixture consists of constituents in indefinite proportion. It may change over time. Air has 78% Nitrogen, 21% Oxygen and 1% other constituents such as $CO _2$, water vapour etc. About 100 years ago the proportion of $CO _2$ in the air was about 0.029% and now it is 0.035%. Thus we see that it's proportion has changed.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Which of the following is a mixture?

  1. Water

  2. Oxygen

  3. Carbon dioxide

  4. Air
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A mixture consists of constituents in indefinite proportion. It may change over time. Air has 78% Nitrogen, 21% Oxygen and 1% other constituents such as CO2, water vapour etc. About 100 years ago proportion of CO2 in air was about 0.029% and now it is 0.035%. Thus we see that it's proportion has changed. Therefore, air is a mixture.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Which of the following is not a property of a mixture?

  1. Mixtures have definite set of properties

  2. Components in mixture retain their original properties

  3. The parts of mixture can be separated by physical means

  4. Mixtures do not have a sharp melting or boiling point
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The important point regarding mixture is that it always retain the original property of its components, so mixture dont have any definite set of properties.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Which of the following is an example of mixture in which various constituents are mixed uniformly?

  1. Solution of salt in water

  2. Air

  3. Alloy

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Solution of salt in water, air, alloy are all examples of homogeneous mixture. They are formed by mixing different elements in to form a mixture which is in single state. Hence they are also called as homogeneous mixture.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

What is a mixture?

  1. Substance with two or more different particles

  2. Substance that is insoluble

  3. Substance with a single homogenous particle

  4. None of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A substance which contains two or more different particles is known as mixtures. Example: the Salt solution is made up of two components, salt and water. Therefore, the salt solution is a mixture.


Hence, the correct option is $A$

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Which of the following is a mixture?

  1. Air

  2. Alloys

  3. Both A and B

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Air is a homogeneous mixture. However, the Earth's atmosphere as a whole is a heterogeneous mixture. Alloys are made when two or more metals are mixed together. They usually are homogeneous mixtures. Examples include brass, bronze, steel, and sterling silver.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

In a mixture of kerosene and water, kerosene forms the:

  1. Lower layer

  2. Upper layer

  3. It mixes with water and forms no layer

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When two liquids do not mix, they form two separate layers and are known as immiscible liquids. These two liquids can be separated by using a separating funnel. It will separate the immiscible liquids into two distinct layers depending on their densities. The heavier liquid forms the lower layer while the lighter one forms the upper layer. Kerosene has lower density than water and hence forms the upper layer.