11. (i) . A complex of a certain metal ion has a magnetic moment of 4.90 B.M. Another complex of the same metal ion in the same oxidation state has a magnetic moment of 0 B.M. Which one among the following central metal ions could produce these data? (a)Cr3+, (b) Mn3+, (c) Fe2+ or (d) Co2+ (neatly, show all your calculations) (ii) . In question (i) above, if a metal ion has a com- plex ion with magnetic moments 4.90B.M. and 2. 8 B.M, then the central metal ion is?