Tag: chemistry

Questions Related to chemistry

Atmospheric pressures recorded in different cities are as follows:

Cities Shimla Bangalore Delhi Mumbai
$p$ in $N/m^{2}$ $1.01\times 10^{5}$ $1.2\times 10^{5}$ $1.02\times 10^{5}$ $1.21\times 10^{5}$


Consider the above data and mark the place at which liquid will boil first.

chemistry materials liquid crystals liquid state the liquid state

  1. Shimla

  2. Bangalore

  3. Delhi

  4. Mumbai

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Correct Option: A
Explanation:

The boiling point of a liquid is the temperature at which vapour pressure becomes equal to the atmospheric pressure. Lower the atmospheric pressure, lower is the boiling point.

Since the atmospheric pressure of the Shimla is minimum, thus the boiling point of the liquid will be lowest at Shimla.

Metallic liquids contain:

chemistry materials liquid crystals liquid state the liquid state

  1. metal atoms

  2. ions and mobile electrons

  3. aggregates of metal atom

  4. none of these

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Correct Option: B
Explanation:

When metals are in liquids, they dissociate into ions and give away electrons. So, metallic liquids contain ions and mobile electrons.

Ex: $Na _{(s)}\longrightarrow Na^+ _{(ag)}+e^-$
Ex: $Mg _{(s)}\longrightarrow Mg^{+2} _{(ag)}+2e^-$

When a solid crystal is melted, it should become a liquid. Liquid crystals are an intermediate stage between a liquid and a crystal. Which of the following is a liquid crystal of a non-living system?

chemistry materials liquid crystals liquid state the liquid state

  1. Cholesteryl bromide

  2. Axons of nerve

  3. Striated muscle fibre

  4. Cilia

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Correct Option: A
Explanation:

Axons of nerve, striated muscle fibre, cilia all belong to bio-logical living systems.

Cholesteryl bromide $(C _{27}H _{45}Br)$ is a liquid crystal of a non-living system.

.......................... 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

Show answer
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

Show answer
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.

Show answer
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.