Tag: elements, compounds and mixtures

Quizzes (19) Questions (57)

Questions Related to elements, compounds and mixtures

Multiple choice separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

A drop each of two non-corrosive and non-irritating liquids A and B at a temperature of $22^o$C are placed on the skin. Liquid 'A gives a more cooling sensation than liquid B. Which of the following can be said about the liquids A and B?

  1. Liquid A has higher boiling point than that of liquid B

  2. Liquid A has higher latent heat of vaporization than that of liquid B.

  3. Liquid A has lower latent heat of vaporization than that of liquid B.

  4. The boiling points of liquid A and B are equal.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Light A gives a more cooling sensation than liquid B means liquid A is early vaporised than liquid B. Thus, liquid A has less B P and lower latent heat of vaporisation than that of liquid B.

Multiple choice separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

At higher altitudes the boiling point of liquid is lowered because :

  1. temperature is low

  2. pressure is high

  3. temperature is high

  4. atmospheric pressure is low
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A liquid reaches its boiling point when its vapor pressure is equal to the atmosphere around it.

 Because the presence of solute lower the vapor pressure, the boiling point is raised

Multiple choice separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

Which of the following solutions will have the highest boiling point?

  1. $0.1M\quad { FeCl } _{ 3 }$
  2. $0.1M\quad { BaCl } _{ 2 }$
  3. 0.1M $NaCl$
  4. 0.1 M $Urea$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Boiling point elevation depends on the solvent, of course, but we're assuming water, and upon the concentration of the solute and how many particles into which the solute breaks. Colligative properties like boiling point elevation, depend on the total number of particles in solution. The solvent used here is water. So elevation in boiling point will be above a boiling point of water for all solutions.
Boiling point $\alpha$ van't hoff factor
$FeCl _{3}      ,  i=4$
$BaCl _{2}       ,  i=3$
$NaCl   ,    i=2$
so  $FeCl _{3}$  has higher value of $i$
so it has Highest BP.

Multiple choice separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

The ability of the particles of a gas or liquid to move out and fill up all available space is called.

  1. Melting

  2. Transfusion

  3. Evaporation

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

Diffusion refers to a process by which molecules intermingle as a result of their kinetic energy of random motion. Molecules of gases are in constant motion and make numerous collisions with the partition.

Multiple choice separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

How would you confirm that a colourless liquid given to you is pure water?

  1. By tasting it

  2. By determining the boiling point of the liquid

  3. By its volume measurement

  4. All of the above is done to check the purity of water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

By determining the boiling point of the liquid and comparing it with a colourless liquid, we can confirm whether it is pure water or not

Multiple choice separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

Diffusion technique of separation can be used for :

  1. Separation of oxygen from air

  2. Recovery of hydrogen in oil refinery

  3. Separation of methane in bio gas

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gas mixtures can be effectively separated by synthetic membranes made from polymers such as poly-amide or cellulose acetate, or from ceramic materials. It can be used for separation of nitrogen or oxygen from air. Helps in Recovery of hydrogen in oil refinery processes. Also used in Separation of methane from the other components of bio gas.

Multiple choice separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

Liquefaction of gases helps in :

  1. storing a gas in a compact form

  2. transporting a gas easily

  3. both a and b

  4. none of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The most important advantage of liquefying gases is that they can then be stored and transported in much more compact form than in the gaseous state. Two kinds of liquefied gases are widely used commercially for this reason, liquefied natural gas (LNG) and liquefied petroleum gas (LPG).