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Surface Chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistrySurface Chemistry1 Mark
Question
$\mathrm{Fe}(\mathrm{OH})_3$ colloid positively charged, when prepared by adding $\mathrm{FeCl}_3$ to hot water?
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Answer

The adsorption of positively charged $\mathrm{Fe}^{3+}$ ions by the sol of hydrated ferric oxide results in positively charged colloid.

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