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Question

The nature of charge on resulting colloidal particles when FeCl3 is added to excess of hot water is:

A
positive
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B
neutral
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C
sometimes positive and sometimes negative
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D
negative
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Solution

The correct option is A positive
If FeCl3 is added to excess hot water, a positively charged sol of hydrated ferric oxide is formed due to the absorption of Fe3+ ions.
Negatively charged sol of hydrated ferric oxide is formed when ferric chloride is added to NaOH solution.

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