Answer: c. iron (III) hydroxide
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical equation for solution of iron(III) nitrate is mixed with a solution of sodium hydroxide is:
As iron(III) hydroxide is insoluble in water , it is formed as a solid which is called as precipitate.