(a) Transition metals have high enthalpies of atomization due to presence of unpaired electrons in (n-1)d orbital which are able to make strong inter atomic metallic bonds.
(b) Manganese has a lower melting point even though it has a higher number of unpaired electrons for bonding. Since, the number of unpaired electron increases, the strength of metallic bond between two metal atoms in the metallic lattice also increases due to which melting point of the metal also increases.
(c) The formation of Ce4+ is favoured by the noble gas configuration of Xe but being a strong oxidant it reverts back to +3 state, oxidizing others and getting itself reduced. The reduction potential is favourable for this which is Ce4+/Ce3+= 1.74V. This reduction potential tells that it can oxidize water into oxygen.
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