Question

The hypothetical complex chloro diaquatriammine cobalt (III) chloride can be represented as

• A. [CoCl(NH3)3(H2O)2]Cl2
• B. [Co(NH3)3(H2O)Cl3]
• C. [Co(NH2)3(H2O)2Cl]
• D. [Co(NH3)3(H2O)3Cl3]

Answer 1

Answer: (A)

[CoCl(NH3)3(H2O)2]Cl2

Answer 2

The correct option is (A) : [CoCl(NH3)3(H2O)2]Cl2

[CoCl(NH3)3 (H2O)2]Cl2 is the chemical name for chlorodiaquatriamminecobalt (III) chloride. Since Co has a +3 charge, just one chloride ion has to be in the complex to satisfy primary valency, but two chloride ions must be outside of it.