SELECT * FROM question_mgmt as q WHERE id=1958 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=64 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

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+

Answer:

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-


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