Tag: materials around us

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

Liquids are known to have density lower than solid because:

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

Liquids have lower density than solids because the particles in liquids are less tightly packed, resulting in larger intermolecular spaces compared to the rigid, closely packed structure of solids.

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

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Which of the following can be a definition for solids? 

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. gas, liquid, solid

  2. liquid, solid, gas

  3. liquid, gas, solid

  4. solid, gas, liquid

  5. solid, liquid, gas
Reveal answer Fill a bubble to check yourself
E Correct answer
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.

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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'. 

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

At which temperature the density of water will be highest?

  1. $0^o C$
  2. $4^o C$
  3. $80^o C$
  4. $-4^o C$.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.