Assertion :Colloidal silver iodide is prepared by adding silver nitrate in slight excess to potassium iodide solution. When subjected to an electric field, the colloidal particles migrate to the anode. Reason: Colloidal particles adsorb ions and thus become electrically charged.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Colloidal silver iodide is negatively charged due to adsorption of iodide ions from excess of $K I$ and hence under influence of electric field it displaces towards positive electrode that is Anode.
So both are correct and reason is correct explanation for assertion.

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