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Which of the following complex ion absorb visible light ?
\( \mathrm{P} \)
(a) \( \left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]^{3+} \)
(b) \( \left[\mathrm{Ti}(\mathrm{en})_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{4+} \)
W
(c) \( \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
(d) \( \left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \)
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