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Explain giving reasons:

Mixing of equivalent amount of yellow As2O3 sol with red Fe(OH)3 sol gives rise to a colourless solution along with a sediment.

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In As2O3 sol colloidal particles are negatively charged, while Fe(OH)3 particles are positively charged. So the particles mutually discharge each other and coagulation occurs. Solution thus becomes colourless and sediments of Fe(OH), and As2O3 separate.

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