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Please,please help me Cobalt(III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25°C ?

Cobalt(III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25°C ?

  • Option 1)

    CoCl3- 5NH3

  • Option 2)

    CoCl3- 6NH3

  • Option 3)

    CoCl3- 3NH3

  • Option 4)

    CoCl3- 4NH3

 
Answers (1)
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As we discussed in the concept

Werner's Theory and it's limitation -

       Postulates of Werner's theory

  1. Metals show two types of linkages, Primary and Secondary.
  2. Secondary valencies are non ionisable.
  3. Primary valencies are normally ionisable.
  4. The groups bond by the seconadry linkages has spatial arrangement. 

        Limitations of Warner's theory

  1. Did not tell why only certain elements have ability to form complexes
  2. Gave no explanation for directional properties of bonds in coordination compounds.
  3. Could not explain the magnetic and optical properties  

- wherein

Eg. PdCl_{2}.4NH_{3} ,Secondary valency = 4 and these are satisfy by neutral molecule or negative ion.

Primary valency is satisfy by negative ion. 

 

 \left [ Co\left ( NH_{3} \right )_{6} \right ]Cl_{3}, \left [ Co\left ( NH_{3} \right )_{5}Cl \right ]Cl_{2} \:and \left [ Co(NH_{3})_{4}Cl_{2} \right ]Cl

give white precipitate with AgNo but \left [ Co(NH_{3})_{3} Cl_{3}\right ]

does not give white ppt with AgNo3


Option 1)

CoCl3- 5NH3

Option is incorrect

Option 2)

CoCl3- 6NH3

Option is incorrect

Option 3)

CoCl3- 3NH3

Option is correct

Option 4)

CoCl3- 4NH3

Option is incorrect

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