Tag: methods of separation

Quizzes (9) Questions (57)

Questions Related to methods of separation

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

Due to difference in degree of adsorption of gases by charcoal, a mixture of noble gases can be separated by adsorption on:

  1. burnt charcoal

  2. coconut charcoal

  3. powdered charcoal

  4. coke
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Due to difference in degree of adsorption of gases by charcoal, a mixture of noble gases can be separated by adsorption double walled tube containing coconut charcoal.

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

Which of the following statements are true with respect to the effect of solubility with temperature?

  1. Solubility of gas in liquid increases with temperature

  2. Solubility of gas in liquid decreases with temperature

  3. Solubility of solute in solution increases with temperature

  4. Solubility of solute in solution decreases with temperature
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

Due to the increase in kinetic energy at higher temperature, the solvent milecules effectively break the solute molecules that are held together by intermolecular forces.

Therefore, solubility of solute in solution increases with temperature.
Also, the higher kinetic energy causes more motion in the gas molecules which break intermolecular bonds & escape from solution.
Therefore, solubility of gas decreases with temperature.

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

The volume of water that would convert $10\ ml$ of decamolar $HCl$ solution to decamolar solutions is 

  1. $10^{3}\ ml$
  2. $10^{2}\ ml$
  3. $9.9\times 10^{3}\ ml$
  4. $1.2\ L$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Milli moles of conc.HCl=milli moles of dil HCl
10×10=V×11010×10=V×110⇒V=1000ml⇒V=1000ml
Thus 990ml of water should be added to 10ml on conc.HCl to get decinormal solution.
Hence (a) is the correct answer.
Multiple choice separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

An azeotropic mixture cannot be separated into its components by fractional distillation.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An azeotropic mixture cannot be separated into its components by fractional distillation because, when an azeotrope is boiled, the vapor has the same proportions of constituents as the unboiled mixture. The statement is true  

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

A homogeneous liquid-liquid solution is separated by:

  1. distillation

  2. decantation

  3. sublimation

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

Distillation is a method of separating mixtures based on differences in their volatiles in a boiling liquid mixture. Distillation is a unit operation, or a physical separation process, and not a chemical reaction. Water is distilled to remove impurities, such as salt from seawater. 

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

Explain how individual gases can be separated from a gaseous mixture of $O _2$, $H _2$ and $CO _2$.

  1. Passing through $KOH$ solution, then diffusion

  2. Partial evaporation, then diffusion

  3. Preferential liquefaction, then partial evaporation

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

Individual gases can be separated from a gaseous mixture of $O _2$, $H _2$ and $CO _2$ passing through $KOH$ solution, then diffusion. $KOH$ will absorb $CO _2$ gas. $O _2$ and $H _2$ have different rates of diffusion as they have different molecular weights.

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

How will you separate dioxide, from the mixture of carbon monoxide and carbon dioxide?

  1. By passing through water under high pressure

  2. By passing through concentrated NaOH solution

  3. by passing through ammonical cuprous

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

The mixture of carbon monoxide and carbon dioxide can be separated by passing the mixture through water under high pressure or through concentrated NaOH solution.Also mixture can be separated by passing it through ammonical cuprous.

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

To separate a mixture of two or more gases ___________ method is used.

  1. sedimentation

  2. liquification

  3. distillation

  4. decantation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To separate a mixture of two or more miscible liquids for which the difference in boiling points is less than 25 K, fractional distillation process is used.

For example, for the separation of different gases from air.