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?

(a) CoCl3.3NH3

(b) CoCl3 .NH3

(c) CoCI3 .5NH3

(d) CoCl3.6NH3

Concept Videos :-

#27 | Werner Theory

Concept Questions :-

Werner’s Theory

[Co(NH3)6]Cl3 [Co(NH3)6]3+ + 3Cl-

[Co(NH3)3]Cl3 [Co(NH3)2Cl3]

[Co(NH3)4Cl2)Cl [Co(NH3)4 Cl2]+ +Cl-

[Co(NH3)5Cl]Cl2  [Co(NH3)5]2+ + 2Cl-

So, [Co(NH3)3]Cl3] does not ionise so does not give test for chloride ions.

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