- Why [Cu CI4]2- exist but [Cu I4]2- does not?
- Show that all octahedral complexes of nickel must have high spin?
- Both[ Fe (CN)6]3- and [Fe (H2O)6]3+ are colourless in dilute solution .Why?
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1). Cu+2 when reduced to Cu+ and Cu, it has standard electrode potential 0.16 V and 0.34 V respectively.
Cl2 has an E0 of 1.36 V and I2 has an E0 of 0.53 V which shows that iodine is less electronegative so the iodide anions would react with the cupric cations yielding iodine and either metallic copper or cuprous cations. Thus, the [CuI4]2- does not exists while [CuCl4]2- exists.