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Surface Chemistry
Question
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A colloidal solution of Agl is prepared by two different methods shown below:

(i) What is the charge of AgI colloidal particles in the two test tube (A) and (B).
(ii) Give reason for the origin of change. 

Answer

Answer:

When silver nitrate solution is added to potassium iodide solution, negatively charged sol of AgI is formed this due to selective adsorption of I- ion from the dispersion medium.
AgI + I- ---> [AgI]I-
On other hand when KI is added to AgNO3 solution a positively charged sol of AgI is formed this is due to slective adsorption of Ag+ ion present in the dispersion medium.
AgI + Ag+ ---> [AgI]Ag+.

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