Chemistry ยท Science General

Separation Techniques

842 Questions

Separation techniques involve physical methods to isolate mixtures, including distillation, filtration, and crystallization. Competitive exams frequently test these foundational concepts. Review the exact processes to enhance problem solving speed.

Distillation and evaporationCrystallization processFiltration methodsSeparating dissolved solidsChromatography and mass techniques

Separation Techniques Questions

Multiple choice

Which of the following statements is/are not false? A. In column chromatography, the more highly absorbed component is eluted with less polar solvents. B. Benzoic acid can be extracted from water using ethanol. C. Number of replaceable hydroxyl ions present in one molecule of a base is called its acidity.

  1. Only A

  2. Only A and B

  3. Only B

  4. Only C

  5. Only B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because number of replaceable hydroxyl ions present in one molecule of a base is called its acidity is true statement.

Multiple choice

Elion is a liquid, usually highly toxic, that is created only when petroleum is pumped rapidly by offshore petroleum rigs. If and only if the maximum pumping rate of a rig's machinery is exceeded will Elion be released into the surrounding water, usually in unpredictable amounts. A technique must be developed to safely dispose off Elion. Most of the Elion produced at offshore petroleum rigs is shipped to the mainland for disposal in underground caves, but not all caves can safely contain the highly toxic liquid.

Which one of the following can be inferred from the passage?

  1. If petroleum producers were able to predict the amount of Elion released, they would be better able to facilitate safe disposal.

  2. If Elion is not released into the surrounding water, the petroleum well's maximum suggested pumping rate has not been exceeded.

  3. No underground cave can safely contain Elion.

  4. Some Elion is sent to underground caves that cannot safely contain it.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

You know this is true because if and only if the petroleum well's maximum pumping rate is exceeded, Elion is released into the water. There's no other way for it to be released, so if it isn't, the maximum pumping rate must not have been exceeded.

Multiple choice

Ammonium chloride can be separated from a mixture by

  1. Evaporation

  2. Distillation

  3. Sublimation

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ammonium chloride is a substance that undergoes sublimation, meaning it transitions directly from a solid to a gas when heated. This property is used to separate it from non-sublimable solids.

Multiple choice

A mixture of water and kerosene oil can be separated by

  1. Evaporation

  2. Distillation

  3. Separating Funnel

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water and kerosene are immiscible liquids. A separating funnel is the standard apparatus used to separate two immiscible liquids based on their density difference.

Multiple choice

A mixture of alcohol and water can be separated by?

  1. Fractional distillation

  2. Separating Funnel

  3. Evaporation

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

Alcohol and water are miscible liquids with different boiling points. Fractional distillation is the standard laboratory method used to separate such mixtures.

Multiple choice

Impure table salt can be purified by?

  1. Crystallization

  2. Distillation

  3. Filtration

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

Crystallization is the process of forming solid crystals from a solution, which is the standard method for purifying solid substances like table salt.

Multiple choice

A suspension of chalk and water is separated by?

  1. Filtration

  2. Evaporation

  3. Sedimentation

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

A suspension of chalk and water contains insoluble particles. Filtration is the most effective way to separate these solid particles from the liquid.

Multiple choice

Distilled water used in laboratory is made by?

  1. Distillation

  2. Filtration

  3. Evaporation

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

Distilled water is produced through the process of distillation, which involves boiling water into steam and then condensing it back into a liquid to remove impurities. Filtration and evaporation do not remove dissolved impurities as effectively as distillation.