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Assertion: Fe3+ can be used for coagulation of As2S3 sol.

Reason: Fe3+ reacts with As2S3 to give Fe2S3.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

1 Answer

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Best answer

Correct option  (c)

Explanation:

When oppositely charged sols are mixed in almost equal proportions, their charges are neutralised. Both sols may be partially or completely precipitated. When negatively charged As2S3 sol is added to positively charged Fe(OH)3 sol in suitable amounts, precipitation of both the sols take place simultaneously.

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