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Which of the following has \(\mu =0\mathrm{BM}\)? (Memory Based JEE Mains SHIFT-1 22/01/2025)

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Which of the following has \(\mu =0\mathrm{BM}\)?

(Memory Based JEE Mains SHIFT-1 22/01/2025)

a

\({\mathrm{K}}_{4}\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]\)

b

\({\mathrm{K}}_{3}\left[\mathrm{Fe}{\left(\mathrm{SCN}\right)}_{6}\right]\)

c

\({\mathrm{K}}_{3}\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]\)

d

\({K}_{2}\left[\mathrm{Fe}{\left({\mathrm{NH}}_{3}\right)}_{5}Br\right]\)

✓ Correct answer: a)

\({\mathrm{K}}_{4}\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]\)

Explanation

\({\mathrm{CN}}^{-}\) is the strongest ligand among all, hence pairing occurs in this case and for the complex \({\mathrm{K}}_{4}\left[\mathrm{Fe}{(\mathrm{CN})}_{6}\right],\mu =0\mathrm{BM}\)

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