Tag: adsorption and colloids

Quizzes (5) Questions (127)

Questions Related to adsorption and colloids

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

Removal of chlorine from drinking water in the food industry is done by adsorption :

  1. True

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

 Activated carbon filtration is a commonly used technology based on the adsorption of contaminants onto the surface of a filter. This method is effective in removing certain organics (such as unwanted taste and odours, micropollutants), chlorine, fluorine or radon from drinking water or wastewater.

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.