Tag: the liquid state

Questions Related to the liquid state

At high altitudes, water boils at a lower temperature because

chemistry materials liquid crystals liquid state the liquid state

  1. the atmospheric pressure is high at high altitudes

  2. the viscosity of water is reduced at high altitudes

  3. the atmospheric pressure is low at high altitudes

  4. the surface tension of water is reduced at high altitudes

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Correct Option: C
Explanation:

The boiling of water depends on the atmospheric pressure at that altitude. At high altitudes, the pressure is lower, so water can not boil at $100°$. As the altitude increases, the boiling point of water reduces.

Liquids are similar to gases because:

chemistry materials liquid crystals liquid state the liquid state

  1. both possess the property of flowing and take the volume of the containers

  2. both diffuse and take the shape of the containers

  3. both are readily compressible and diffuse

  4. both are capable of infinite expansion

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Correct Option: B
Explanation:

Liquids and gases are similar in both shape and volume because they both have its' shape determined by its' surroundings. 

$\Longrightarrow $ Both diffuses and take the shape of containers.

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

Show answer
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.