Which of the following statements is/are correct?

Options

A. In lassaigne's test for halogens, conc. `HNO_3` is used to remove `HCN` and `H_2S`
B. When an organic compound is heated with dry `CuO` and the gases evolved are passed through lime water which turns milky, the gass may be `CO_2` or `SO_2`.
C. In Carius method, sulphur is oxidised to `SO_4^(2-)` ion with fuming `HNO_3`
D. In lassaigne's test, N present in the organic compound is converted into `CN^(c-)` ions.

Answer

A, B, C, D

Explanation

All the statements are self explanatory.