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Question

Assertion :Colloidal solutions are electrically neutral. Reason: Dispersed phase and dispersion medium are of same charge.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is C Assertion is correct but Reason is incorrect

Let's take an example of Fe(OH)3, to make a Fe(OH)3 sol we need to add FeCl3, the Fe(OH)3 sol particles adsorb the Fe3+ ions on their surface.

But the entire solution is electrically neutral. Because for each Fe3+ adsorbed on the sol, there are three free Cl ions present in the medium.


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