1.

Which of the following does not exist?

Answer»

`WO_(4)^(2-)`
`CrO_(4)^(2-)`
`VO_(4)^(3-)`
`[CuI_(4)]^(2-)`

Solution :`I^(-)` is good reducing agent and `Cu^(2+)` is good oxidizing agent
`2CU^(2+) + 4I^(-) RARR underset(("WHITE ppt"))(Cu_(2) I_(2))` + I_(2)`


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