When pyridine is added to an aqueous solution of nickel sulfate followed by the addition of an aqueous solution of sodium nitrite,deep blue crystals of .......... are obtained.
- A$[Ni(Py)_4]SO_4$
- B$[Ni(Py)_2(NO_2)_2]$
- C$[Ni(Py)_4](NO_2)_2$
- D$[Ni(Py)_3(NO_2)]_2SO_4$
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