Assertion : ${F e}^{3 +}$ can be used for coagulation of ${A s}_{2} S_{3}$ sol. Reason: ${F e}^{3 +}$ reacts with ${A s}_{2} S_{3}$ to give ${F e}_{2} S_{3}$ .

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 oppositely charged sols are mixed in almost equal proportions, their charges are neutralized. Both sols may be partially or completely precipitated.
When negatively charged $A s_{2} S_{3}$ sol is added to positively charged $F e (O H)_{3}$ sol, in suitable amounts, precipitation of both the sols take place simultaneously.

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