1.

Acqueous solution of nickel sulphate on treating with pyridine and then adding a solution of sodium nitrate 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)`

SOLUTION :`NiSO_(4)+4py+2NaNO_(3)toNa_(2)SO_(4)+underset("Blue")([Ni(py)_(4)](NO_(2))_(2))`


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