Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

MEDIUM

Earn 100

In a coagulation experiment, $5 ml$ of ${As}_{2} S_{3}$ is mixed with $0.1 M$ solution of electrolyte $AB$ so that the total volume is $10 ml$ . It was found that all solution coagulates leaving $AB$ equivalent to $0.4 ml$ of $0.1 M$ in the solution. Calculate the flocculation value of $AB$ for ${As}_{2} S_{3}$ sol.

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 :

Question Image

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

EASY

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 :

Question Image

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

EASY

Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

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

EASY

Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

What is peptization? Give an example.

EASY

Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Fog is a colloidal solution of:

EASY

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:

MEDIUM

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?

EASY

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

MEDIUM

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

EASY

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)

EASY

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?

EASY

Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

Define the following terms with suitable examples: Peptisation.

EASY

Chemistry>Physical Chemistry>Adsorption and Colloids>Colloids

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