solution
is added to 
solution a negatively charged
colloidal sol is formed but when solution is added
to solution positively charged sol
results, Explain.
Answer:
When silver nitrate solution is
added to potassium iodide solution, the precipitated silver iodide adsorbs
iodide ions from the dispersion medium and negatively charged colloidal
solution results. However when KI solution is added to 
solution
positively charged solution results due to adsorption of 
ions from the dispersion medium.
(i)
(ii) 
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