Is precipitated from solutions as a white solid but turns dark green and then brown…

CHEMISTRY · Single correct · CBSE · Chemistry · Chemical Reactions and Equations · Chemical Reactions and Equations

Problem

\text{Fe}(\text{OH})_2

is precipitated from

\text{Fe}(\text{II})

solutions as a white solid but turns dark green and then brown due to the formation of : (1)

\text{Fe}(\text{OH})_2

and

\text{Fe}(\text{OH})_3

(2) only

\text{Fe}(\text{OH})_3

(3)

\text{Fe}_2\text{O}_3 \text{·} (\text{H}_2\text{O})_n

(4)

\text{Fe}_2\text{O}_3 \text{·} 2\text{H}_2\text{O}