Coordination CompoundHard
Question
A coordination compound of cobalt has the molecular formula containing five ammonia molecules, one nitro group and two chlorine atoms for one cobalt atom. One mole of this compound produces three moles of ions in an aqueous solution. The aqueous solution on treatment with an excess of AgNO3 gives two moles of AgCl as a precipitate. The formula of this complex would be
Options
A.[Co(NH3)4(NO2)Cl] [(NH3)Cl]
B.[Co(NH3)5Cl] [Cl NO2]
C.[Co(NH3)5(NO2)]Cl2
D.[Co (NH3)5] [(NO2)2Cl2]
Solution
[Co(NH3)5(NO2)]Cl2 
[Co(NH3)5(NO2)]2+ (aq) + 2Cl-(aq) (no. of ions = 3)
2Ag+ + 2Cl- → 2AgCl ↓ (white).
[Co(NH3)5(NO2)]2+ (aq) + 2Cl-(aq) (no. of ions = 3)2Ag+ + 2Cl- → 2AgCl ↓ (white).
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