A chemistry problem by puneet mangla

Which of following statements are correct:-

a) E0 value of Ni2+ /Ni is more negative due to more hydration energy of Ni2+.

b) Cr2+ is reducing as Cr3+ has t2g filled configration.

c) Mn3+ is oxidising as Mn2+ has t2g full filled configration.

d) The energy to transform Cu(s) ---> Cu2+ is balanced by its hydration energy.

e) all d block elements have one or more typical structures at normal temperature.

f) Mn and Tc have exceptionally low m.p.

g) metals of 2 and 3 d-series have less enthalpy of atomisation.

h) d block elements show inert pair effect.