Which of the following are diamagnetic? (I) \( \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\...

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Which of the following are diamagnetic?
(I) \( \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
(II) \( \mathrm{K}_{3}\left[\mathrm{Cr}(\mathrm{CN})_{6}\right] \)
(III) \( \mathrm{K}_{3}\left[\mathrm{Co}(\mathrm{CN})_{6}\right] \)
(IV) \( \mathrm{K}_{2}\left[\mathrm{Ni}(\mathrm{CN})_{4}\right] \)
\( P \)
Select the correct answer using the codes given below :
W
(a) I, II and IV
(b) I, III and IV
(c) II and III
(d) I and IV
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