1.

Assign reasons for the following : (i) Copper (I) ion is not known in aqueous solution. (ii) Actinoids exhibit greater range of oxidation states than lanthanoids.

Answer»

Solution :Assign REASON for the FOLLOWING: Copper (I) ION is not known in aqueous solutions.
`2Cu^(+) rarr Cu^(2+) + 2 Cu`
The greater stability of `Cu^(2+)` ion as compared to `Cu^+` is due to the much more negative `Delta_(hydH)` of`Cu^(2+)`than `Cu_((aq))^(+)`which mor than compensates for the second IONIZATION enthalpy of Cu.


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