The elements of 3d transition series are...

The elements of 3d transition series are given as :
Sc Ti V Cr Mn Fe Co Ni Cu Zn
Answer the following :
(i) Write the element which shows maximum number of oxidation states. Give reason.
(ii) Which elements has the highest m.p?
(iii) Which element is a strong oxidizing agent in +3 oxidation state and why ?

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