Q. 21

(a) Account for t

Answer :

(a)


(i) Many copper (I) compounds are unstable in aqueous solution and undergo disproportionation reaction. The stability of Cu2+ rather than Cu+ is due to the much more negative hydration enthalpy of Cu2+ than Cu+, which more than compensates for the second ionization enthalpy of Cu.


2Cu+ Cu2+ + Cu


(ii) The transition metals form a large number of complex compounds. This is due to


• Comparatively smaller sizes of the metal ions,


• their high ionic charges, and


• The availability of d orbitals to accommodate lone pair of electrons donated by ligands.


(b) Cr2O72- + 8H+ + 3NO2- 2Cr3+ + 3NO3- + 4H2O


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