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Question

Assertion :Sb2S3 is not soluble in yellow ammonium sulphide. Reason: The common ion effect due to S2 ions reduce solubility of Sb2S3.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is D Both Assertion and Reason are incorrect
Sb2S3 react with yellow ammonia sulphate and hence it is soluble in yellow ammonia sulphide and produces thiosalts.
The following reaction takes place:
Sb2S3 +3(NH4)2 S 2 (NH4)3 SbS2
Hence assertion is incorrect.
Ordinary ammonium sulphates cannot dissolve Sb2S3 but yellow ammonium sulphates. It is because yellow ammonium sulphates contains excess of sulphur. So the common ion effect due to S2 ion will increase solubility of Sb2S3
Hence reason is incorrect.

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