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Question:
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Choose the complex which is paramagnetic
(i) $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(ii) $\mathrm{K}_{3}\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]$
(iii) $\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
(iv) $\mathrm{K}_{2}\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]$
Options:
(i) $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(ii) $\mathrm{K}_{3}\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]$
(iii) $\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
(iv) $\mathrm{K}_{2}\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]$
Solution:
2447 Upvotes
Verified Answer
The correct answer is:
(i),(ii) and(iii)
(i) $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(ii) $\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-}$
(iii) $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$
(iv) $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$
Thus complexes (i), (ii) and (iii) are paramagnetic species.
(ii) $\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-}$
(iii) $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$
(iv) $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$
Thus complexes (i), (ii) and (iii) are paramagnetic species.
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