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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

(a) `[Ni(NO_2)_6]^(4-)lt[Ni(NH_3)_6]^(2+)`
`lt[Ni(H_2O)_6]^(2+)`

B

(b) `[Ni(NO_2)_6]^(4-)lt[Ni(H_2O)_6]^(2+)`
`lt[Ni(NH_3)_6]^(2+)`

C

(c) `[Ni(H_2O)_6]^(2+)lt[Ni(NH_3)_6]^(2+)`
`lt[Ni(NO_2)_6]^(4-)`

D

(d) `[Ni(NH_3)_6]^(2+)lt[Ni(H_2O)_6]^(2+)`
`lt[Ni(NO_2)_6]^(4-)`

Text Solution

Verified by Experts

The correct Answer is:
A
The absorption of energy or the observation of colour in a complex transition compound depends on the charge of the metal ion and the nature of the ligands attached. The same metal ion with different ligands shows different absorption depending upon the type of ligand. The presence of weak field ligands make the central metal ion to absorb low ligands can be obtained from spectrochemical series i.e., (weak field) `I^(-)Br^(-)ltS^(2-)ltCl^(-)ltNO_3^(-)ltF^(-)ltOH^(-)ltH_2OltNH_3ltNO_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.

The correct order for the wavelengths of absorption in the visible region for the following : underset((1))([Ni(NO_(2))_(6)]^(4-))," "underset((II))([Ni(NH_(3))_(6)]^(2+))," "underset((III))([Ni(H_(2)O)_(6)]^(2+))," "underset((IV))([NIF_(6)]^(4-))

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+) ?