In the estimation of sulphur organic compound on treating with conc. `HNO_(3)` is converted to

When Sn is treated with conc. HNO_(3)

In the estimation of sulphur in an organic compound, fuming nitric acid is used to convert sulphur into :

Aniline when treated with conc. HNO_3 gives

Aniline when treated with conc. HNO_3 gives