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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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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