Question

Which of the following reactions does not involve oxidation-reduction?

• A. $2Rb+H_{2}O \rightarrow 2RbOH+H_{2}$
• B. $2CuI_{2} \rightarrow 2CuI+I_{2}$
• C. $CuO+H_{2} \rightarrow Cu+H_{2}O$
• D. $4KCN+Fe\left(\right.CN\left(\left.\right)_{2} \rightarrow K_{4}\left[\right.Fe\left(\right.CN\left(\left.\right)_{6}\left]\right.$

Answer 1

Answer: (D)

There is no change in the oxidation number of any species in the reaction so neither oxidation nor reduction occurs here.
$4KCN+Fe\left(\right.CN\left(\left.\right)_{2} \rightarrow K_{4}\left[\right.Fe\left(\right.CN\left(\left.\right)_{6}\left]\right.$