Tag: the liquid state

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Questions Related to the liquid state

Multiple choice chemistry materials liquid crystals liquid state the liquid state

Which one of the following is a correct statement?
1. Ice provides more cooling effect than water at $273\ K$.
2. Evaporation of a liquid causes cooling.
3. Increase of pressure lowers the separation between the particles of matter.

  1. $1$ and $2$
  2. $1$ and $3$
  3. $2$ and $3$
  4. $1, 2$ and $3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ice provides more cooling effect than water at 273 K because of latent heat of fusion. Evaporation of a liquid causes cooling as the surface molecules take away heat to escape out. Increase of pressure lowers the separation between the particles of matter and brings them closer leading to change of state from gas to liquid and to solid.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

The best evidence for the existence and movement of particles in liquids was provided by ______________.

  1. John Dalton

  2. Thomas Edison

  3. J.J. Thomson

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

Robert brown observed a weak solution of milk and later pollen grains in suspension with a high-powered microscope, and saw that the particles of milk and the pollen grains showed a violent and random motion. This motion was named as Browninan motion.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

What is the shape of the meniscus observed when water and mercury are taken in two different capillary tubes?

  1. Concave and convex

  2. Convex and concave

  3. Both concave

  4. Both conves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The shape of the meniscus observed when water and mercury are taken in two different capillary tubes is concave and convex respectively.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

The amount of energy required to change $1\ kg$ of a solid into liquid at atmospheric pressure at its melting point is known as _______________.

  1. latent heat of fusion

  2. latent heat of boiling

  3. latent heat of freezing

  4. melting energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The amount of energy required to change $1\ kg$ of a solid into liquid at atmospheric pressure at its melting point is known as latent heat of fusion.

Hence option A is correct.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

These two compounds are in the liquid phase at $293\ K$ :

  1. $Br _{2}$ and $Hg$
  2. $Cl _{2}$ and $F _{2}$
  3. $NH _{4}^{+}$ and $H _{3}O^{+}$
  4. $Fe$ and $Co$

  5. Diamond and graphite
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Br _2$ and $Hg$ are in the liquid phase at $293 :K$.
$Cl _2$ and $F _2$ are gases.
$NH _4^+$ and $H _3O^+$ exist in aqueous solution.
$Fe$ and $Co$ are solids
Diamond and graphite are also solids.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

An experiment is conducted where droplets of liquid are placed on the surface of a penny. Which of the following substances would you expect to the able to place the maximum number of drops of on the surface of the penny?

  1. $HF$
  2. $H _{2}O$
  3. $CH _{3}CH _{2}CHO$
  4. $CCl _{4}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fluorine is most electronegative element so it forms stronger hydrogen bond which is the reason of stronger surface tension.So HF drops place maximum on the penny.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

What happens to the rate of evaporation of water, if the atmospheric pressure is decreased during the extraction of colored components?

  1. Increases

  2. Decreases

  3. Do not change

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

The rate of evaporation of water increases, if the atmospheric pressure is decreased during the extraction of colored components because atmospheric pressure is inversely proportional to evaporation. 

Multiple choice chemistry materials liquid crystals liquid state the liquid state

What happens to the rate of evaporation of water, if the atmospheric pressure is increased during the extraction of the colored component from liquid? 

  1. Increases

  2. Decreases

  3. Do not change

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Evaporation is a surface phenomenon in which surface molecules of solution moves to the atmosphere.If atmospheric pressure is increased then due to external pressure molecules on the surface will not move to the atmosphere so if atmospheric pressure increases, a rate of evaporation decreases.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

The volume of gas is reduced to half from its original volume. The specific heat will be :

  1. reduce to half

  2. be doubled

  3. remain constant

  4. increase four times
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Specific heat capacity is an intensive property of a substance. It depends on the nature of the gas and the process (isobaric vs isochoric), not on the volume of the gas.