Answer: [tex]Fe(OH)_2[/tex]
Explanation:
The chemical formula involves ferrous ions [tex]Fe^{2+}[/tex] and hydroxide ions [tex]OH^-[/tex]. They combine in 1:2 ratio so as to form a neutral and stable compound.
[tex]Fe^{2+}+2OH^-\rightarrow Fe(OH)_2[/tex]
The chemical formula is written by exchange of valencies as shown in the image attached.
