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Preparation of Sulphuric Acid: Contact Process

When freshly ...

Question

When freshly precipitated $F e {(O H)}_{3}$ is boiled with water in the presence of few drops of dil. $H C l$ , a hydrated ferric oxide sol is obtained. This method is termed:

A

dialysis

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B

peptization

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C

ultrafiltration

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D

electro-dispersion

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Solution

The correct option is B peptization
Freshly prepared ferric hydroxide on treatment with a small amount of ferric chloride in presence of dil hydrochloric acid solution forms a dark reddish brown solution where Ferric chloride acts as a peptizing agent and the process is known as peptization.

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Q. On adding few drops of dil. HCl to freshly precipitated ferric hydroxide, a red coloured colloidal solution is obtained. The phenomenon is known as :

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