1.

CoCI_(2) givesbluecolourwith NH_(4)SCN duetoformation of

Answer»

`(NH_(4))_(2)[CO(SCN)_(4)]`
`(NH_(4))_(4)[Co(SCN)_(6)]`
`(NH_(4))_(3)[Co(SCN)_(6)]`
`(NH_(4))[Co(SCN)_(4)]`

ANSWER :a


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