What will be the correct order for the wavelengths of absorption in the visible region for the following: [Ni(NO2)6]4–, [Ni(NH3)6]2+, [Ni(H2O)6]2+?
The same metal ion with different ligands shows different absorption depending on the lig-and type. The presence of weak field lig-ands makes the central metal ion capable of absorbing low energy, that is higher wavelengths. Hence, the correct order is (a) [Ni(NO2)6]4- <[NI(NH3)6]2+ <[Ni(H2O)6]2+
