Question

The counter ion in $K_3\left[Fe\right(CN{)}_6]$ is

• A. $K^{+}$
  
• B. $F{e}^{+3}$
  
• C. $C{n}^{-}$
• D. $\left[Fe\right(CN{)}_6{]}^{3-}$

Answer 1

The correct option is A $K^{+}$


Explanation:

What is inside the coordination sphere - $\left[Fe\right(CN{)}_6{]}^{3-}$ - is called complex ion. On the other hand, $K^{+}$ ion present outside the co-ordination sphere is called the counter ion.