Question

accounts for the Mn2O7 is acedic whereas Mno is basic oxide

Answer 1

generally, for transition metals the lower oxidation state is more basic coz it can donate the lone pair nd function as lewis base.. whereas higher oxidation state elements have more acidic nature coz it have tendency to except lone pairs nd function as lewis acid..
therefore, MnO is basic whereas Mn2O7 is acidic
i hope u got my point