Aqueous solution of nickel sulphate on treating with pyridine and then – InterviewSolution

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]_2SO_4` Answer :C

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