Is used in the detection of ions

CHEMISTRY · Single correct · CBSE · Chemistry · Coordination Compounds · Coordination Compounds

Problem

\mathrm{K_3[Fe(CN)_6]}

is used in the detection of

\mathrm{Fe^{2+}}

ions, with which it gives a deep blue colour. This colour is due to the formation of: (1)

\mathrm{K_2Fe[Fe(CN)_6]}

(2)

\mathrm{Fe_4[Fe(CN)_6]_3}

(3)

\mathrm{Fe[Fe(CN)_6]}

(4)

\mathrm{Fe_3[Fe(CN)_6]_2}