The correct order for the wavelength of absorption in the visible region is
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a
[Ni(NO2)6]4– < [Ni(NH3)6]2+ < [Ni(H2O)6]2+
b
[Ni(NO2)6]4– < [Ni(H2O)6]2+ < [Ni(NH3)6]2+
c
[Ni(H2O)6]2+ < [Ni(NH3)6]2+ < [Ni(NO2)6]4–
d
[Ni(NH3)6]2+ < [Ni(H2O)6]2+ < [Ni(NO2)6]4–
answer is A.
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Detailed Solution
Frequency (energy) of light absorbed ∝ field strength of ligandWave length of light absorbed ∝1field strength of ligandfield strength of NO2−>NH3>H2O∴'λ' absorbed NiNO26−4