Identify the correct statement(s)

When $AgN{O}_3$ solution is added to KI solution a negatively charged sol is formed

When $FeC{l}_3$  is added to $NaOH$  solution, a positively charged sol is formed

To exhibit tyndal effect, the diameter of the dispersed particles should not be much smaller than the wavelength of the light used

The flocculating values of the following ions vary in the order: $A{l}^{3+}>B{a}^{2+}>N{a}^{+}$