Tag: methods of separation

Questions Related to methods of separation

Simple method of separating ammonia and hydrogen is :

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

  1. Passing the mixture through water

  2. Distillation

  3. Filtration

  4. Evaporation

Show answer
Correct Option: A
Explanation:

Passing the mixture through water can separate the mixture of ammonia and hydrogen. Ammonia being highly soluble dissolves in water while hydrogen passes out as gas.

Which of the following has no units?

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

  1. Molarity

  2. Normality

  3. Molality

  4. Mole fraction

Show answer
Correct Option: D
Explanation:

Mole fraction of A in solution containing A and B $=\dfrac {n _A}{n _A+n _B}=\dfrac {mole}{mole}$ which cancels out. 

Hence, it is unitless.

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?

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

  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.

Show answer
Correct Option: C
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.

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

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

  1. temperature is low

  2. pressure is high

  3. temperature is high

  4. atmospheric pressure is low

Show answer
Correct Option: D
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

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

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

  1. $0.1M\quad { FeCl } _{ 3 }$

  2. $0.1M\quad { BaCl } _{ 2 }$

  3. 0.1M $NaCl$

  4. 0.1 M $Urea$

Show answer
Correct Option: A
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.

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

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

  1. Melting

  2. Transfusion

  3. Evaporation

  4. Diffusion

Show answer
Correct Option: D
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.

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

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

  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

Show answer
Correct Option: B
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

Diffusion technique of separation can be used for :

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

  1. Separation of oxygen from air

  2. Recovery of hydrogen in oil refinery

  3. Separation of methane in bio gas

  4. All of above

Show answer
Correct Option: D
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.

Which gas will diffuse more rapidly through porous component?

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

  1. Lighter gases

  2. Heavier gases

  3. Weight does not matter

  4. Highly dense gases

Show answer
Correct Option: A
Explanation:

Lighter gases diffuse more rapidly through porous component.

Liquefaction of gases helps in :

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

  1. storing a gas in a compact form

  2. transporting a gas easily

  3. both a and b

  4. none of above

Show answer
Correct Option: C
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).