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. Only I
B. Only II
C. Both I and II
D. Neither I nor II

Answer

C

Explanation

Both the statement are correct. `NO_(3)+ 3Fe^(2+) + 4H^(+) to NO+ 3Fe^(3+)+ 2H_(2)O`
`[Fe(H_(2)O)_(6)]^(2+) NO to underset("Brown cooured complex")[Fe(H_(2)O)_(5)(NO)]^(2+)+H_(2)O`