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In Carius method for sulphur estimation, what happens to sulphur present in the organic compound during heating with fuming HNO₃?

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Question

In Carius method for sulphur estimation, what happens to sulphur present in the organic compound during heating with fuming HNO₃?

Options

  • It is reduced to H₂S

  • It remains unreacted

  • It is oxidised to H₂SO₄

  • It forms SO₂ gas only

MCQ
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Solution

It is oxidised to H₂SO₄

Explanation: 

Fuming nitric acid oxidises sulphur present in the compound to sulphuric acid, which is then converted to BaSO₄ by BaCl₂.

 
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