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Classification of Colloids - Based on Phases

Assertion :Wh...

Question

Assertion :When $A g N O_{3}$ is treated with excess of potassium iodide, colloidal particles gets attracted towards anode. Reason: Precipitate adsorb common ions (excess) and thus, become 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 C Assertion is correct but Reason is incorrect
When a dilute solution of potassium iodide is added to a slight excess of a dilute solution of silver nitrate, a positive charged sol of silver iodide is formed. It is due to the adsorption of $A g^{+}$ ions from the dispersion medium on the precipitate of silver iodide (AgI).
However, when a dilute solution of silver nitrate is added to a slight excess of dilute solution of potassium iodide, a negatively charged sol of silver iodide is formed. It is due to the adsorption of iodide ions from the dispersion medium on the precipitate of silver iodide. So, colloidal particles gets attracted towards anode.

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