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The correct order for the wavelength of absorption
\( \mathrm{P} \) in the visible region is :

W
(1) \( \left[\mathrm{Ni}\left(\mathrm{NO}_{2}\right)_{6}\right]^{4-}\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \)
(2) \( \left[\mathrm{Ni}\left(\mathrm{NO}_{2}\right)_{6}\right]^{4-}\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \)
(3) \( \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\left[\mathrm{Ni}\left(\mathrm{NO}_{2}\right)_{6}\right]^{4-} \)
(4) \( \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\left[\mathrm{Ni}\left(\mathrm{NO}_{2}\right)_{6}\right]^{4-} \)
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