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In ionisation isomerism, secondary valencies can be replaced by primary valencies on the condition that net charge going outside the coordination sphere must be equal to net charge coming inside it . Here NO2 ligand has charge - 1 on it . So how can it be replaced by SO4 which has -2 charge? Thanks!

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You have two complexes.

  • $\ce{[Cu(NH3)5(NO2)]SO4^{-1}}$
  • $\ce{[Cu(NH3)5(SO4)]NO2^{-1}}$

Both $\ce{NO2^-}$ and $\ce{SO4^{2-}}$ are necessary for the overall complex to have a -1 charge overall. It just depends on which is attached directly to the copper ion.

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