Assertion :Gold sol prepared by reduction method is negatively charged. Reason: The negative charge is due to the adsorption of negatively charged $A u O_{2}^{-}$ ions on dispersed phase particles.

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
Gold sol prepared by reduction method is negatively charged.
$2 A u C l_{3} + 3 S n C l_{2} \to 3 S n C l_{4} + 2 A u (S o l)$
The negative charge is due to the adsorption of negatively charged $A u O_{2}^{-}$ ions on dispersed phase particles.
Hence, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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