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

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.

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

Application of adsorption chromatography is/are _________.

  1. separation of relatively non polar, water insoluble compounds

  2. seperation of isomers

  3. purification of antibody fragments

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

Adsorption chromatography has many applications. Generally, it is used for determining the concentration of a compound (or its purity), separating out a mixture into individual componentsseperation of isomers, and identifying what is in a mixture and seperate on the basis of solubility also. There are three main types of adsorption chromatography - column, thin layer, and gas-solid.

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

Adsorption column chromatography has been used for :

  1. isolation and purification of vitamins and hormones

  2. examination of vegetable oil and pharmaceutical preparations

  3. used as indicator

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

Column chromatography is used for isolation and purification of vitamins and hormones and for the examination of vegetable oil and pharmaceutical preparations.

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

Which of the following is most favourable for vander waals  adsorption?

  1. high pressure and high temperature

  2. low pressure and low temperature

  3. low pressure and high temperature

  4. high pressure and low temperature
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Physisorption is Vanderwaals adsorption, it occurs at high pressure and low temperature conditions.

Multiple choice enzymes and catalysts catalysis adsorption and colloids surface chemistry chemistry adsorption theory of heterogeneous catalysis

What does a catalyst do?

  1. Alter the state of equilibrium.

  2. Decreases the activation energy.

  3. Increases collision frequency.

  4. Increases the average kinetic energy of reacting species.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Catalyst is a substance, which lowers the activation energy of reaction because it provides an alternate pathway for reaction. Also, it increases backward and forward reaction to the same extent. Due to this lower activation energy, equilibrium is attained faster.