(C) At the isoelectric point,the net charge on the colloidal particles becomes zero,meaning they become uncharged. Due to the lack of electrostatic re

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Colloidal particles become uncharged

(C) At the isoelectric point,the net charge on the colloidal particles becomes zero,meaning they become uncharged. Due to the lack of electrostatic repulsion,the particles aggregate and settle down,leading to the precipitation of the colloidal sol. Therefore,both $B$ and $C$ are technically correct,but $C$ describes the fundamental state at the isoelectric point.