If \( \left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+} \) absorbs a light...

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If \( \left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+} \) absorbs a light of wavelength 600 \( \mathrm{nm} \) for \( \mathrm{d}-\mathrm{d} \) transition, then the value of octahedral crystal field splitting energy for \( \left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \) will be \( \times 10^{-21} \mathrm{~J} \). (Nearest integer)
(Given: \( \mathrm{h}=6.63 \times 10^{-34} \mathrm{Js} \) and \( \mathrm{c}=3.08 \times 10^{8} \mathrm{~ms}^{-1} \) )
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