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Read the given passage and answer the question :

Colloidal particles always carry an electric charge which may be either positive or negative. For example, when $AgNO_{3}$ solution is added to $KI$ solution, a negatively charged colloidal sol is obtained. The presence of equal and similar charges on colloidal particles provide stability to the colloidal sol and if, somehow, charge is removed, coagulation of sol occurs. Lyophobic sols are readily coagulated as compare to lyophilic sols.

What is the reason for the charge on sol particles ?

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