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.Ferric hydroxide forms a lyophobic sol. ... The hydrolysis reaction produces insoluble ferric hydroxide particles which undergo agglomerisation to yield bigger particles of colloidal dimensions. These particles adsorb Fe3+ ions preferentially from the solution to give positive charge to the sol particles.The colladial particles in ferric hydroxide carry positive charge and hence ferric hydroxide solution is positively charged

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Hii aspirants

let me clear your doubt.

Ferric hydroxide forms a lyophobic sol.  The hydrolysis reaction produces insoluble ferric hydroxide particles which undergo agglomerisation to yield bigger particles of colloidal dimensions. These particles adsorb Fe3+ ions preferentially from the solution to give positive charge to the sol particles.thus The colladial particles in ferric hydroxide carry positive charge and hence ferric hydroxide solution is positively charged.

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