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Methods to Form Lyophobic Colloids

When freshly ...

Question

When freshly precipitated $F e (O H)_{3}$ is shaken with aqueous solution of $F e C l_{3}$ , a colloidal solution is formed. This process is known as:

A

Emulsification

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B

Coagulation

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C

Peptization

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D

Electro-osmosis

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Solution

The correct option is C Peptization
Conversion of a freshly prepared ppt. into a colloidal solution by application of a suitable electrolyte is called peptization.

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Q. What happens when
(a) a freshly prepared precipitate of

F e (O H)_{3}

is shaken with a small amount of

F e C l_{3}

solution?

(b) persistent dialysis of a colloidal solution is carried out?

(c) an emulsion is centrifuged?

Q. What happens when a freshly prepared precipitate of

F e (O H)_{3}

is shaken with a small amount of

F e C l_{3}

Q. When a small quantity of

F e C l_{3}

solution is added to the fresh precipitate of

F e (O H)_{3}

, a colloidal sol is obtained. The process through which this sol is formed is known as:

Q. On adding few drops of dilute

H C l

F e C l_{3}

to freshly precipitated ferric hydroxide, a red coloured colloidal solution is obtained. This phenomenon is known as :

Q. A freshely prepared

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precipitate is peptized by adding a solution of

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. The charge on colloidal particle is due to the preferential adsorption of:

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