Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

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How will you prepare colloidal solution of gold?

Important Questions on Adsorption and Colloids

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

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.

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

What is peptisation ? Give one example.

HARD

Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

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) ?

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

For coagulation of arsenious sulphide sol, which of the following salt solutions will be most effective?

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

What is peptization? Give an example.

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Fog is a colloidal solution of:

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Write short note on the following-

Peptisation

MEDIUM

Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Among the following, the correct statement is:

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Define peptization.

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Draw a labelled diagram of the electrical dispersion method for preparation of colloidal solution.

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

The coagulating power of electrolytes having ions

{Na}^{+}

,

{Al}^{3 +}

and

{Ba}^{2 +}

for arsenic sulphide sol increases in the order,

MEDIUM

Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

What happens when a freshly prepared precipitate of

Fe (OH)_{3}

is shaken with a small amount of

{FeCl}_{3}

solution?

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of

A s_{2} S_{3}

are given below,

I .

(N a C l) = 52

II .

(B a C l_{2}) = 0.69

III .

(M g S O_{4}) = 0.22

The correct order of their coagulating power is

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

25 mL

of silver nitrate solution

(1 M)

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

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

When a sulphur sol is evaporated sulphur is obtained. On mixing with water sulphur sol is not formed. The sol is

HARD

Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

The correct statement(s) about surface properties is(are)

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

The most appropriate method of making egg-albumin sol is:

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Bredig's arc method is used to prepare which of the following sol?

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Define the following terms with suitable examples: Peptisation.

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Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Using Bredig's arc method, which of the following metallic sols cannot be prepared _______