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Consider the following complexes:
(i) trans- \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+} \)
(2) \( \operatorname{cis}-\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{2}(\mathrm{en})_{2}\right]^{3+} \)
\( \mathrm{P} \)
(4) \( \mathrm{NiCl}_{4}^{2-} \)
W
(5) \( \mathrm{TiF}_{6}^{2-} \)
(6) \( \mathrm{CoF}_{6}^{3-} \)
Choose the correct code :
(a) (1), (2) are optically active, (3) is optically inactive
(b) (2) is optically active; (1), (3) are optically inactive
(c) (4), (5) are coloured and (6) is colourless
(d) (4) is coloured and (5), (6) are colourless
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