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.

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