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

1. CoCl3·4NH3
2. CoCl3·5NH3
3. CoCl3·6NH3
4. CoCl3·3NH3

Correct answer: CoCl3·6NH3

Solution

In CoCl3·6NH3, all three chloride ions are coordinated to the cobalt ion, leaving no free chloride ions in solution to react with silver nitrate. Hence, it will not give a test for chloride ions.

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