Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5. ml rRo dks igpkusa ftldk +3 vkWDlhdj.k voLFkk esa bysDVªkWfud foU;kl [Ar]3d5 gS % (A) Ru (B) Co (C) Mn (D) Fe

Question

Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5. ml rRo dks igpkusa ftldk +3 vkWDlhdj.k voLFkk esa bysDVªkWfud foU;kl [Ar]3d5 gS %

(A) Ru
(B) Co
(C) Mn
(D) Fe

Prashant Kotian · Accepted Answer

Correct answer: D. 26Fe3+ = 3d5 4s0 27Co3+ = 3d6 4s0 24Cr3+ = 3d3 4s0 25Mn3+ = 3d4 4s0 M+3 = [18Ar] 3d5 4s0 M = [18Ar] 3d6 4s2 so Z for M = 26 and M is Fe.

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