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Q.

Colloidal solution of gold is prepared by:

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a

colloidal mill

b

double decomposition method

c

Bredig's method

d

peptization

answer is C.

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Detailed Solution

  • Gold solution is prepared by Bredig's arc method. 
  • This process involves dispersion as well as condensation.
  • In this method, electric arc is struck between electrodes of the metal immersed in the dispersion medium. 
  • The intense heat produced vaporizes the metal, which then condenses to form particles of colloidal size.
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