A complex compound of cobalt has a molecular formula containing five NH3 molecules, one nitro group and two chlorine atoms for one Co atom. One mole of this compound produces three moles of ions in an aqueous solution. On reacting with excess AgNO3 solution, two moles of AgCl get precipitated. The ionic formula of the compound is?
Correct answer: C. [Co(NH3)5(NO2)] Cl2
- A. [Co(NH3)4NO2Cl] [(NH3)Cl]
- B. [Co(NH3)5Cl] [Cl(NO2)]
- C. [Co(NH3)5(NO2)] Cl2
- D. [Co(NH3)5] [(NO2)Cl2]
Explanation
Precipitating two moles of AgCl indicates that there are two chloride ions in the outer ionization sphere. Producing three moles of ions means the compound dissociates into one complex cation and two chloride anions. The formula. [Co(NH3)5(NO₂)]Cl2 fits both of these observations.
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