Tag: applications of adsorption

Quizzes (0) Questions (26)

Questions Related to applications of adsorption

Multiple choice applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

For purification of tincture of alkaloids from pigments before determination of their alkaloidal content, adsorption column chromatography has been used for separation and purification of the Alkaloids of Atropa Belladonna from the bulk of non- alkaloidal matter present in alumina columns.

  1. True

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

Adsorption Chromatography with alumina as the adsorbent may be used for the separation and purification of the Alkaloids of Atropa Belladonna from the bulk of non- alkaloidal matter present in alumina columns, whereas tincture prepared by the percolation process in adsorption column chromatography.

Multiple choice applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

Which of the following is/are true statement(s)?

  1. Water vapour is absorbed by anhydrous calcium chloride while it is adsorbed by silica gel.
  2. $NH _3$ is absorbed by water but adsorbed by charcoal.

  3. Sugar is decolourized by animal charcoal based on adsorption.
  4. Water is absorbed by conc. $H _2SO _4$.
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

Adsorption is the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent.
Absorption is a physical or chemical phenomenon or a process in which atoms, molecules or ions enter some bulk phase – gas, liquid or solid material.

a) Water vapour is absorbed by anhydrous calcium chloride while it is adsorbed by silica gel.
b) Ammonia is absorbed by water but adsorbed by charcoal.
c) Decolourisation of sugar solution by activated charcoal is another example of adsorption. Charcoal absorbs the colouring material and thus decolourising the solution.
d) Water is absorbed by sulphuric acid because both are in same phase.
NHis absorbed by water but adsorbed by charcoal.

Multiple choice applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

Which of the following can adsorb largest volume of hydrogen gas?

  1. Finely divided platinum

  2. Finely divided nickel

  3. Colloidal solution of palladium

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

Colloidal solution of palladium can adsorb largest volume of hydrogen gas as the surface area of palladium is maximum in its colloidal solution. Higher is the surface area of catalyst, larger will be the volume of hydrogen adsorbed.

Multiple choice applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

Application of adsorption is/are :

  1. For desiccation or dehumidification

  2. Heterogeneous catalysts

  3. For both heterogenous catalysts and for desiccation or dehumidification

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

Applications of adsorption are :

1.Charcoal is used as a decoloriser as it adsorbs the coloring matter from the coloured solution of sugar.

2. Silica gel adsorbs moisture from the desiccators.

3. Silica and alumina gels are used as adsorbents for removing moisture and for controlling humidity of rooms.

4. Activated charcoal is used in gas masks as it adsorbs all the toxic gases and vapours and purifies the air for breathing.

5 .Adsorption processes are useful in carrying out heterogeneous catalysis.