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

Options

A. `CoCI_(3)` . `6NH_(3)`
B. `CoCI_(3)` . `3NH_(3)`
C. `CoCI_(3)` . `4NH_(3)`
D. `CoCI_(3)` . `5NH_(3)`

Answer

B

Explanation

No ppt. of AgC1 will be obtained if all the chlorine particles are part of the coordination sphere as in the complex `CoC1_(3)` . `3NH_(3)` or `[Co(NH_(3))_(3)C1_(3)]` .
`CoC1_(3)` . `6NH_(3)` `implies [Co(NH_(3))_(6)]C1_(3) implies 3` mol AgC1
`CoC1_(3)` . `implies [Co(NH_(3))_(4)C1_(2)]C1 implies 1` mol AgC1
`CoC1_(3)` . `5NH_(3) implies [Co(NH_(3))_(5)C1]C1_(2) implies 2` mol AgC1