Which of the following ion does not exist?

Which of the following ion does not exist?
  1. $\left[\mathrm{CuI}_4\right]^{2-}$
  2. $\mathrm{VO}_4^{3-}$
  3. $\mathrm{WO}_4^{2-}$
  4. $\mathrm{CrO}_4^{2-}$

Solution

$\left[\mathrm{CuI}_4\right]^{2-}$ does not exist because $\mathrm{I}^{-}$being a stronger reducing agent reduces $\mathrm{Cu}^{2+}$ to $\mathrm{Cu}^{+}$. $2 \mathrm{CuI}_2 \longrightarrow 2 \mathrm{CuI}+\mathrm{I}_2$

Asked in: NEET 2022 (Phase 2)

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