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Q.

Colloidal sol of silver is prepared by

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a

Bredig’s arc method

b

Colloidal milk

c

Double decomposition method

d

Peptization

answer is A.

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Detailed Solution

In general silver sol, Gold sol, Pt sol are prepared by Bredig's method principle involved is dispersion and condensation.

Method of preparation: To prepare a silver sol, an electric arc struck between silver electrodes immersed in water(dispersion medium) kept in ice cold bath, Intense heat produced vapourises the metal which then condenses to form particles of colloidal size.                        

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