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Sodium sulphate filtrate formed from first step of oxidation test of sulphur is acidified with dilute hydrochloric acid and a solution of barium chloride to form ________ colour precipitate:

A
blue
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B
red
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C
white
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D
brown
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Solution

The correct option is C white

Oxidation Test:

The organic compound is fused with a mixture of potassium nitrate and sodium carbonate. Sulphur, if present, gets oxidised to sodium sulphate.

3KNO33KNO2+3[O]Na2CO3+S+3[O]Na2SO4+CO2

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.

BaCl2+Na2SO4BaSO4+2NaCl


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