CBSE Class 12 · 2004 · Delhi · Coordination CompoundsShort Answer

a) Give the IUPAC name of [PtCl(NH

_{2}

_{3}

)(NH

_{3}

)

_{2}

]Cl.
b) Compare the magnetic behaviour of the complex entities [Fe(CN)

_{6}

]

^{4 -}

and [FeF

_{6}

]

^{3 -}

. (Atomic number of Fe = 26)

Solution

(a) Ligands alphabetically: ammine, chlorido, methanamine; (−1) + x = +1 ⇒ Pt(II):
\textbf{diamminechlorido(methanamine)platinum(II) chloride}
(b) [Fe(CN)

_{6}

]

^{4 -}

: Fe

^{2 +}

= 3d

^{6}

; CN

^{-}

(strong field) pairs all six electrons (t

_{2 g}^{6}

) — no unpaired electron, \textbf{diamagnetic}.
[FeF

_{6}

]

^{3 -}

: Fe

^{3 +}

= 3d

^{5}

; F

^{-}

(weak field) leaves all five unpaired — \textbf{paramagnetic},

μ = 5 \times 7 = 35 \approx 5.92 BM

CBSE Class 12 Board · 2004 · Delhi · Subjective

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