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-))`

Options

A. `IV gt III gt II gt I`
B. `I gt II gt III gt IV`
C. `III gt IV gt II gt I`
D. `II gt III gt I gt IV`

Answer

1

Explanation

The order of the ligand in the spectrochemical series `:`
`F lt H_(2)O lt NH_(3) lt NO_(2)`
Hence the wavelength of the light observed will be in the order `:`
`[NiF_(6)]^(4-) lt [Ni(H_(2)O)_(6)]^(2+) lt [Ni(NH_(3))_(6)]^(42+) lt [Ni(NO_(2))_(6)]^(4-)`
Thus, wavelength absorbed `[E=(hc)/(lambda)]` will be in the opposite order.