Tag: methods of separation

Questions Related to methods of separation

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

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

  1. burnt charcoal

  2. coconut charcoal

  3. powdered charcoal

  4. coke

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Correct Option: B
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.

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

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

  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

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Correct Option: B,C
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.

$20\ ml$ of a mixture of oxygen and ozone was heated till ozone is completely decomposed. The mixture on cooling was found to have a volume of $21\ ml$. The volume percentage of ozone in the initial gaseous mixture is

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

  1. $20\%$

  2. $7.5\%$

  3. $80\%$

  4. $30\%$

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Correct Option: B

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

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

  1. $10^{3}\ ml$

  2. $10^{2}\ ml$

  3. $9.9\times 10^{3}\ ml$

  4. $1.2\ L$

Show answer
Correct Option: A
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.

Let the solubilities of AgCl in pure water, 0.01 M $CaCl _2$, 0.01 M NaCl & 0.04 M $AgNO _3$ be $S _1, S _2$ & S_3 , S_4$ respectively what is the correct order:

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

  1. $S _1 > S _2 > S _3 > S _4$

  2. $S _1 > S _2 =S _3 > S _4$

  3. $S _1 > S _3 > S _2 > S _4$

  4. $S _4 > S _2 > S _3 > S _1$

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Correct Option: A

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

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

  1. True

  2. False

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Correct Option: A
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  

A homogeneous liquid-liquid solution is separated by:

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

  1. distillation

  2. decantation

  3. sublimation

  4. filtration

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Correct Option: A
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. 

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

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

  1. Passing through $KOH$ solution, then diffusion

  2. Partial evaporation, then diffusion

  3. Preferential liquefaction, then partial evaporation

  4. All of the above

Show answer
Correct Option: A
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.

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

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

  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

Show answer
Correct Option: D
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.

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

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

  1. sedimentation

  2. liquification

  3. distillation

  4. decantation

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Correct Option: C
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.