What are the respective central-metal oxidation state, coordination number, and

Question

What are the respective central-metal oxidation state, coordination number, and overall charge on the complex ion in the following species? [Cr(en)2(NH3)2]Cl2 A) oxidation state = +3; Coordination number = 6; charge = +1 B) oxidation state = +2; Coordination number = 4; charge = ?1 C) oxidation state = +2; Coordination number = 5; charge = +2 D) oxidation state = +2; Coordination number = 6; charge = +2 E) oxidation state = +3; Coordination number = 6; charge = ?1 F) oxidation state = +1; Coordination number = 5; charge = +2 G) oxidation state = +2; Coordination number = 5; charge = ?2 H) oxidation state = +1; Coordination number = 6; charge = ?2 I) oxidation state = +2; Coordination number = 6; charge = ?2

Explanation / Answer

en (ethylenediammine) is a bidentate ligand with 0 charge
NH3 is a monodentate ligand with 0 charge
coordination no.= 2x2+2=6

2 Cl- anions = 2-charge

charge on complex ion= +2

charge on Cr=2+ i.e oxidation state of Cr=(+2)

answer is option (D)

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