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Q.

Principle involved in Bredig’s arc  method is

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a

Dispersion followed by condensation

b

Dispersion only

c

Condensation only

d

Condensation followed by Dispersion

answer is A.

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Detailed Solution

An electric arc is struck between two metal electrodes (whose sol is to be prepared) immersed in dispersion medium (generally water) Intense heat produced vapourizes (dispersion) the metal which then condenses to form particles of colloidal size.

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