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Explain about the oxidation test for sulphur. |
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Answer» Solution :(i) Oxidation test: The organic SUBSTANCES are fused with a mixture of `KNO_(3)` and `Na_(2)CO_(3)`. The sulphur if present is oxidised to sulphate. `Na_(2)CO_(3)+S+3(O) rarr Na_(2)SO_(4) + CO_(2)` (ii) The fused mass is extracted with WATER, acidified with HCl and the `BaCl_(2)` solution is added to it. A white PRECIPITATE indicates the presence of sulphur. `BaCl_(2) + Na_(2)SO_(4) rarr underset("white ppt.")(BaSO_(4)DARR) + 2NaCI` |
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