Question

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Answer 1

14(a) The stability of Cu2+ in aqueous solution rather than Cu+ is due to much larger negative hydration enthalpy which more than compensates the larger ionization energy of Cu2+.

(b) +3 is the most common oxidation states oc lanthanoids

or

(a) Mn²+ has half filled d orbital.That's why it is much stable and hence oxidation is difficult.

(b) D block elements have same C,N,O trapped in them at interstices. These compound are called interstitial compound.