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Which of the following ion does not exist?

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${[{Cul}_{4}]}^{2 -}$

${CrO}_{4}^{2 -}$

${WO}_{4}^{2 -}$

${VO}_{4}^{3 -}$

answer is A.

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Detailed Solution

One reason can be said that the size of iodine ions. and other is that
[CuI₄]^2-does not exist because I^- being a stronger reducing agent reduces Cu²⁺ to Cu⁺.
2CuI₂ $\to$ 2CuI + I₂

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