Which among the following ionic species has the least precipitating power?

Which mixture of the solutions will lead to the formation of a negatively charged colloidal $[AgI]I^{-}$ sol?

If $As_2S_3$ sol is negatively charged,which of the following will be most effective in causing its coagulation?

$100 \ mL$ of $0.0018\%(w/v)$ solution of $Cl^{-}$ ion was the minimum concentration of $Cl^{-}$ required to precipitate a negative sol in one $h$. The coagulating value of $Cl^{-}$ ion is $.......$ (Nearest integer).

Which of the following is a positively charged sol?

When a gel is left standing,it loses a small amount of liquid or water. This phenomenon is called .....