Which of the following combines with `Fe^(2+)` ions to form brown complex ?

Which of the following combines with Fe(II) ions to form a brown complex?

Which of the following combines with Fe(II) ions to form a brown complex ?

Which one of the following combines with Fe(II) ions to form a brown complex ?

Which of the following oxides combines with Fe(II) ions to form a brown complex?

Which combines with Fe^(+2) to form brown complex

In the ring test of NO_(3)^(-) ion, Fe^(2+) ion reduces nitrate ion to nitric oxide, which combines with Fe^(2+) (aq) ion to form brown complex . Write the reactions involved in the formation of brown ring.

In the ring test of NO_(3)^(-) ion, Fe^(2+) ion reduces nitrate ion to nitric oxide, which combines with Fe^(2+) (aq) ion to form brown complex . Write the reactions involved in the formation of brown ring.