Explain why Cu+ ion is not stable in aqueous solutions?
Out of Cu+ and Cu2+, which ion is unstable in aqueous solution and why?
In an aqueous medium, Cu2+ is more stable than Cu+. This is because although energy is required to remove one electron from Cu+ to Cu2+, high hydration energy of Cu2+ compensates for it. Therefore, Cu+ion in an aqueous solution is unstable. It disproportionates to give Cu2+ and Cu.
`2Cu_(""(aq))^+ -> Cu_(" "(aq))^(2+) + Cu_(s)`
Cu+ is unstable in aqueous solution while Cu2+ is more stable. Stability in aqueous medium depends upon the hydration energy. Although it will require energy to remove one electron from Cu+ to convert it into Cu2+ but that is compensated by high hydration energy of Cu2+ . Hence, Cu2+ is more stable than that of Cu+
Give examples and suggest reasons for the following features of the transition metal chemistry:
The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
From the given data of E0 values, answer the following questions :
(1) Why is `E_(((Cu^(2+))/(Cu)))` value exceptionally positive
(2) Why is `E_(((Mn^(2+))/(Mn)))` value is highly negative as compared to other elements
(3) Which is the stronger reducing agents Cr2+ or Fe2+ ? Give Reason.