Read the given passage and answer the questions number 1 to 5 that follow : Colloidal particles always carry an electric charge which may be either positive or negative. For example, when AgNO_3 solution is added to Kl 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. Why a negatively charged sol is obtained on adding AgNO_3 solution to KI solution ?

Read the given passage and answer the questions number 1 to 5 that fol

1.	Read the given passage and answer the questions number 1 to 5 that follow : Colloidal particles always carry an electric charge which may be either positive or negative. For example, when AgNO_3 solution is added to Kl 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. Why a negatively charged sol is obtained on adding AgNO_3 solution to KI solution ?
Answer» SOLUTION :The precipitated `AGI` ABSORBS `I^(-)` ION (common to `AgI and I^(-)`) from the solution of Kl and a negatively CHARGED sol is obtained.