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The correct order for the wavelength of ...

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

A

`[Ti(NO_(2))_(6)]^(3-) lt[Ti(NH_(3))_(6)]^(3+) lt[Ti(H_(2)O)_(6)]^(3+)`

B

`[Ti(NO_(2))_(6)]^(3-) lt[Ti(NH_(2)O)_(6)]^(3+) lt[Ti(NH_(3))_(6)]^(3+)`

C

`[Ti(H_(2)O)_(6)]^(3+) lt[Ti(NH_(3))_(6)]^(3+) lt[Ti(NO_(2))_(6)]^(3-)`

D

`[Ti(NH_(3))_(6)]^(3+) lt[Ti(H_(2)O)_(6)]^(3+) lt[Ti(NO_(2))_(6)]^(3-)`

Text Solution

Verified by Experts

The correct Answer is:
A
The presence of weak field ligands make the central metal ion to absob low energies i.e., of higher wavelength. The field strangth of ligands can be obtained from spectrochemical series. i.e. (weak field) `I^(-)lt Br^(-)ltS^(2-)ltCl^(-)ltNO_(3).^(-)ltF^(-)ltOH^(-)ltH_(2)OltNH_(3)ltNO_(2-)ltCN^(-)ltCO` (strong field)
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Statement-1: The correct order for the wave length of absorption in the visible region is : [Ni(NO_(2))_(6)]^(4-)lt[Ni(NH_(3))_(6)]^(2+)lt[Ni(H_(2)O)_(6)]^(2+) Statement-2: The stability of different complexes depends on the strength of the ligands field of the various ligands.

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