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  • Which of the following is a positively charged colloidal particle?Option: 1 <img alt="\mathrm{As}_{2} \mathrm{~S}_{3}" src="https://entrancecorner.on

Which of the following is a positively charged colloidal particle?

Option: 1

\mathrm{As}_{2} \mathrm{~S}_{3}


Option: 2

\mathrm{Al}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O}


Option: 3

\mathrm{Au}


Option: 4

\mathrm{Pt}


Answers (1)

best_answer

\mathrm{Al}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O} [Generally, oxides are positively charged colloidal solutions.]

Colloidal particles always carry an electric charge. The nature of this charge is the same on all the particles in each colloidal solution and may be either positive or negative. Hydrated metallic oxide like \mathrm{Al}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O} is an example of a positively charged colloid whereas metals, e.g., copper, silver, gold sols, sols of starch, gum, gelatine, clay, charcoal, etc and acid dye stuffs, e.g., eosin form negatively charged colloid.

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vishal kumar

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