# The nature of charge on resulting colloidal particles

Question:

The nature of charge on resulting colloidal particles when $\mathrm{FeCl}_{3}$ is added to excess of hot water is:

1. positive

2. neutral

3. sometimes positive and sometimes negative

4. negative

Correct Option: 1

Solution:

If $\mathrm{FeCl}_{3}$ is added to excess of hot water, a positively charged sol of hydrated ferric oxide is formed due to adsorption of $\mathrm{Fe}^{3+}$ ions.