" 8.9Explain why Cu' ion is not stable in aqueous solutions? "

(a) Why do transition metals and their compounds are found to be good catalysts? (b) The 5d series of transition metals have more frequent metal-metal bonding in their compounds than do the 3d and 4d metals. Explain. (c ) Why do transition metals form complexes? (d) Explain why Cu^+ ion is not stable in aqueous solution. (e ) Why is europium (II) more stable than cerium (II)?

Assertion : Cu^+ ion is not stable in aqueous solution. Reason : Cu^+ contains 3d-filled subshell.

Account for the following: (i) Cu^(+) ions are not stable in aqueous solution. (ii) Most of the transition metal ions exhibit paramagnetic behaviour.

Which one of the following ions is the most stable in aqueous solutions ?