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Question

Bredig's arc method cannot be used for the preparation of colloidal sol of ?

A
Copper
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B
Gold
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C
Silver
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D
Sodium
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Solution

The correct options are
A Copper
D Sodium
The method of preparation of collodial solution of metals such as platinum, gold or silver is known as Bredig's arc method.

It consists of both dispersion and condensation. It can not be used to prepare a colloidal solution of copper and sodium.

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