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CBSE Class 12-science Answered

Given the molecular formula of the hexa-coordinated complexes (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3. If the number of co-ordinated NH3 molecules in i, ii and iii respectively are 6, 5, 4, the primary valencies in (i), (ii) and (iii) are ?

Asked by bjayanta | 24 Mar, 2019, 08:56: PM
Expert Answer
the primary valencies in (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3. If the number of co-ordinated NH3 molecules in i, ii and iii respectively are 6, 5, 4,(i), (ii) and (iii) are 3, 2 and 1 respectively.
 
(i) CoCl3.6NH3 in this complex Co is co-ordinated with six NH3 molecules, which means the primary valency of Co is 3. complex is [Co(NH3)6]Cl3
 
(ii) CoCl3.5NH3 in this complex Co is co-ordinated with five NH3 molecules, which means the primary valency of Co is 2.complex is [Co(NH3)5]Cl2
 
(iii) CoCl3.4NH3 in this complex Co is co-ordinated with four NH3 molecules, which means the primary valency of Co is 1.complex is [Co(NH3)4]Cl

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