EASY
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How does the solvent exchange process carried out?

Important Questions on Surface Chemistry

MEDIUM

The diagram given below represents a method for the preparation of colloids. With reference to the diagram answer the questions that follow : 

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What is the nature of the sol obtained by this method ---lyophilic or lyophobic? Identify A in this diagram.

HARD

A colloidal solution of AgI is prepared by two different methods as shown below : 

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What is the charge on AgI colloidal particles in the two test tubes (A) and (B) ?

EASY
The most appropriate method of making egg-albumin sol is:
MEDIUM
Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration?
EASY

Write short note on the following-

Peptisation

MEDIUM
Draw a labelled diagram of the electrical dispersion method for preparation of colloidal solution.
MEDIUM
What happens when a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution?
MEDIUM
Which of the following is used for the preparation of colloids ?
MEDIUM
25 mL of silver nitrate solution (1M) is added dropwise to 25 mL of potassium iodide (1.05 M) solution. The ion(s) present in very small quantity in the solution is/are
EASY
A sample of red ink (a colloidal suspension) is prepared by mixing eosine dye, egg white, HCHO and water. The component which ensures stability of the ink sample is :
EASY
Freshly prepared precipitate sometimes gets converted to colloidal solution by
EASY

Match List - I with List - II.

List-I
(Colloid Preparation Method)
List-II
(Chemical Reaction)
(a) Hydrolysis (i) 2AuCl3+3HCHO+3H2O2Au(sol)+3HCOOH+6HCl
(b) Reduction (ii) As2O3+3H2 SAs2 S3(sol)+3H2O
(c) Oxidation (iii) SO2+2H2 S3 S(sol)+2H2O
(d) Double Decomposition (iv) FeCl3+3H2OFe(OH)3(sol)+3HCl

Choose the most appropriate answer from the options given below :

MEDIUM
Bredig's arc method is used to prepare which of the following sol?
EASY
Define the following terms with suitable examples: Peptisation.
EASY
Using Bredig's arc method, which of the following metallic sols cannot be prepared _______