Answer :

(i)-(c), (ii)- (a), (iii)-(b)


(i)-(c) Osmium has the highest oxidation state of +8 because it can expand it’s octet and use all its 8 electrons.


Electronic configuration of Os- [Xe] 4f14 5d6 6s2


5d6 and 6s2 can be excited to get an oxidation state of +8


(ii)-(a) Manganese can show upto +7 oxidation state


(iii)-(b) 3d block element with highest is Cr.


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