1.

Aqueous solution of nickel sulphate on treating with pyridine and then adding a solution of sodium nitrite gives dark blue crystals of

Answer»

` [NI (py)_4]SO_(4)`
`[Ni(py)_(2)(NO_(2))_(2)]`
`[Ni(py)_(4)](NO_(2))_(2)`
`[Ni(py)_(3)(NO_(2))]_(2)SO_(4)`

Answer :C


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