Question

Which of the following ion does not exist?

• A. $[Cu{I}_4{]}^{2-}$
• B. $V{O}_4^{3-}$
• C. $W{O}_4^{2-}$
• D. $Cr{O}_4^{2-}$

Answer 1

Answer: (A)

${\left[Cu{I}_4\right]}^{2-}$ does not exist because I- being a stronger reducing agent reduces $C{u}^{2+}$ to $C{u}^{+}$

$2Cu{I}_2⟶2CuI+I_2$