Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options given. Column I (ion) Column II (E.C.) (a) Mn2+ (i) [Ar]3d6 (b) Cu+ (ii) [Ar] (c) Sc3+ (iii) [Ar]3d10 (d) Fe2+ (iv) [Ar]3d5

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

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

25Mn: [Ar]4s23d5 (a) Mn2+ : [Ar]3d5 29Cu: [Ar]4s13d10 (b) Cu+ : [Ar]3d10 21Sc: [Ar]4s23d1 (c) Sc3+ : [Ar] 26Fe: [Ar]4s23d6 (d) Fe2+ : [Ar]3d6