1.

What will be the correct order for the wavelengths of absorption in the visibleregion for the following: `[Ni(NO_(2))_(6)]^(4-), [Ni(NH_(3))_(6)]^(2+), [Ni(H_(2)O)_(6)]^(2+)` ?

Answer» In all the complexes , the metal ion is the same `(Ni^(2+))`. The increasing field strengths of the ligands present at per electrochemical series are in order :
`H_(2)O lt NH_(3) lt NO_(2)^(-)`
The energies absorbed for exciation will be in the order :
`[Ni(H_(2)O)_(6)]^(2+) lt [Ni(NH_(3))_(6)]^(2+) lt [Ni(NO_(2))_(6)]^(4-)`
As E = `hc / lambda , the wavelengths absorbed will be in the opposite order .


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