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Coordination Compounds
Question
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Cobalt (III) chloride forms several octahedral complexes with ammonia, which of the following will not give a test for chloride ions with silver nitrated at 250 C? 

  • CoCl. 3NH3

  • CoCl. 4NH3

  • CoCl. 5NH3

  • CoCl. 6NH3

Answer

A.

CoCl. 3NH3

a) [Co(NH3)3Cl3] --> [Co(NH3)2Cl3]
b) [Co(NH3)4Cl2]Cl --> [Co(NH3)4Cl2]+ +Cl-
c)[Co(NH3)5Cl]Cl2  --> [Co(NH3)5Cl]+ +2Cl-
d) [Co(NH3)6Cl]Cl2  --> [Co(NH3)6]+ +3Cl-
In the compound (a) does not ionise so does not give test for chloride ions.

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