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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Follow the order:

In the isoelectronic series of metal carbonyls,the $CO$ bond strength is expected to increase in the order:

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