Tag: materials around us

Questions Related to materials around us

.......................... is more dense in liquid state than in solid.

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. Water

  2. Alcohol

  3. Acetone

  4. All of above

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Correct Option: A
Explanation:

Water is the only substance that is more dense in a liquid state than in a solid state. Liquid water is most dense when it is cold and salty. 

Which of the following is a property of liquid?

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. fixed volume

  2. no fixed shape

  3. no distinct boundaries

  4. all of the above

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Correct Option: D
Explanation:

Liquids have no fixed shape but have a fixed volume. They take up the shape of the container in which they are kept. Hence do not have distinct boundaries.

Which of the following is true for gases?

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. Gases do not have a fixed volume.

  2. Gases do not have a fixed shape.

  3. Gases are not rigid.

  4. All of the above.

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Correct Option: D
Explanation:

Gases neither have a definite shape nor  have a definite  volume. They fill up the container completely. They are not rigid.

Which of the following have a definite shape and volume?

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. Solids

  2. Liquids

  3. Gases

  4. All of the above

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Correct Option: A
Explanation:

Solids have a definite shape and volume. For example, gold is solid and it has both shape and volume.

Hence (A) is the correct option.  

Liquids are known to have density lower than solid because:

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. the number of particles is less and the inter-molecular space is minimum

  2. the number of particles is less and the inter-molecular space is more.

  3. the number of particles is least and the inter-molecular space is more.

  4. the number of particles is less and the inter-molecular space is maximum.

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Correct Option: B

The combustion of candles, containing paraffin wax, to carbon dioxide and water vapor is:

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. sublimation as well as chemical reaction with oxygen

  2. only sublimation

  3. not sublimation but a chemical reaction with oxygen

  4. none of above

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Correct Option: C
Explanation:

The term sublimation refers to a physical change of state and is not used to describe transformation of a solid to a gas in a chemical reaction. The combustion of candles, containing paraffin wax, to carbon dioxide and water vapor is not sublimation but a chemical reaction with oxygen.

Which of the following can be a definition for solids? 

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. A state of matter that has a definite volume but not a definite shape.

  2. A state of matter that has both a fixed volume and shape.

  3. A state of matter that does not have a definite volume or shape.

  4. A state of matter that conducts electricity well.

  5. A state of matter similar to gas that has free electrons.

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Correct Option: B
Explanation:

The molecules of a solid are fixed within the solid, and they just vibrate about their mean position. 


Due to this constant positioning, solids have a fixed volume and shape.

Hence the correct option is B.

Arrange the density of three types of matter in decreasing order.

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. gas, liquid, solid

  2. liquid, solid, gas

  3. liquid, gas, solid

  4. solid, gas, liquid

  5. solid, liquid, gas

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Correct Option: E
Explanation:

Density means how much dense or rigid the particles in a matter are. 


A solid is denser than the liquid and a liquid is denser than the gas.


Thus the decreasing order of density should be solid, liquid, gas. 


Hence, the correct option is E.

According to the concept of 'panch tattvas', the matter can be classified into the air, water, sky, fire, and earth.

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. True

  2. False

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Correct Option: A
Explanation:

According to ancient philosophies, the matter was classified as air, water, earth, fire, and sky. This classification is based on the sources of matter. Since there are five sources, hence it was also called as 'panch tattvas'. 

At which temperature the density of water will be highest?

chemistry materials around us and different types of houses materials around us matter and its states different states of matter

  1. $0^o C$

  2. $4^o C$

  3. $80^o C$

  4. $-4^o C$.

Show answer
Correct Option: B
Explanation:
In ice, the water molecules are in a crystal structure that has a lot of empty space.

When the ice melts to liquid water, the structure collapses and the density of the liquid increases.

At temperatures well above freezing, the molecules move faster and get further apart. The density decreases as temperature increases.

Now, let's cool the water.

As the temperature of warm water decreases, the water molecules slow down and the density increases.

At 4 °C, the clusters start forming.

Cluster formation is the bigger effect, so the density starts to decrease. 
Thus, the density of water is a maximum at 4 °C.

Option (B) is correct here.