Brown ring test for nitrates depends on
I. the ability of `Fe^(2+)` to reduce nitrates to nitric oxide,
II. Its reaction with `Fe^(2+)` to form a brown coloured complex.
Which of the above statements regarding brown test for nitrates is/are true?

Options

A. oxidation of NO to `NO_(2)`
B. the reduction of nitrate to nitric oxide
C. reduction of ferrous sulphate to iron
D. oxidising action of sulphuric acid

Answer

2