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In Carius method, sulphur is oxidised to ${SO}_{4}^{2 -}$ ion with fuming HNO₃

In Lassaigne's test, N present in the organic compound is converted into ${CN}^{⊖}$ ions.

When an organic compound is heated with dry CuO and the gases evolved are passed through lime water which turns milky, the gas may be CO₂ or SO₂.

In Lassaigne's test for halogens, conc. HNO₃ is used to remove HCN and H₂S.

answer is A, B, C, D.

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Detailed Solution

HCN and H₂S may interfere in halogen detection , if not removed

CuO will act as oxidising agent and convert C to CO₂

sulphur precipitated as BaSO₄

L. extract will have NaCN

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