Q31 / 180 · AIIMS 2013 · Chemistry

Which of the following ion does not exist?

  • Correct answer
    A
    $\left[\mathrm{CuI}_4\right]^{2-}$
  • B
    $\mathrm{VO}_4^{3-}$
  • C
    $\mathrm{WO}_4^{2-}$
  • D
    $\mathrm{CrO}_4^{2-}$

Solution

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

Hence, the correct answer is option: 'A'.

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