Question

The correct order for the wavelength of absorption in the visible region is

Answer 1

The central metal ion in all the three complexes is the same. Therefore, absorption in the visible region depends on the ligands. The order in which the CFSE values of the ligands increases in the spectrochemical series is as follows:

H2O < NH3 < NO2 -

Thus, the amount of crystal-field splitting observed will be in the following order:



Hence, the wavelengths of absorption in the visible region will be in the order:

[Ni(H2O)6]2+ > [Ni(NH3)6]2+ > [Ni(NO2)6]4-

Answer 2

Options are not provided in the question. The complete question is as following:

The correct order for the wavelength of absorption in the visible region is

(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:

Wavelength of light is known as the distance of the light wave between the two successive troughs or crests.

Explanation:

The colour detection or energy absorption in a complex transition compound depends on the existence of the attached lig-ands and the charging of the metal ion.

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.

The central metal ion in all three complexes is the same. Thus, absorption in the visible region depends on the ligands. In the spectrochemical sequence, the order in which the crystal field stabilization energy values of the lig-ands increase is as follows:

H2 O < NH3  < NO2

Hence, the correct order is  (a) [Ni(NO2)6]4- <[NI(NH3)6]2+ <[Ni(H2O)6]2+.

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