In the oxidation test of sulphur, organic compound is fused with a mixture of:

sodium nitrite & potassium sulphide

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potassium carbonate & sodium nitrate

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potassium nitrate & sodium carbonate

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none of the above

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Solution

The correct option is C potassium nitrate & sodium carbonate
Oxidation Test: The organic compound is fused with a mixture of potassium nitrate and sodium carbonate. Sulphur, if present, gets oxidised to sodium sulphate.
$3 K N O_{3} ⟶ 3 K N O_{2} + 3 [O] {N a}_{2} C O_{3} + S + 3 [O] ⟶ {N a}_{2} S O_{4} + C O_{2}$
The fused mass is extracted with water, the contents are boiled and filtered. The filtrate contains sodium sulphate. The filtrate is acidified with dilute hydrochloric acid and a solution of barium chloride is added. Formation of a white precipitate indicates the presence of sulphur.
$B a {C l}_{2} + {N a}_{2} S O_{4} ⟶ B a S O_{4} ↓ + 2 N a C l$

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