SATHEE: Coordination Compounds - Result Question 65

Coordination Compounds - Result Question 65

####72. Atomic number of $C r$ and $F e$ are respectively 25 and 26 , which of the following is paramagnetic?

[2002]

(a) $[C r (C O)_{6}]$

(b) $[F e (C O)_{5}]$

(d) $[C r (N H_{3})_{6}]^{+ 3}$

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Solution:

(d) $C r^{3 +}$ has $4 s^{0} 3 d^{3}$ electronic configuration with 3 unpaired electrons, hence paramagnetic. In other cases, pairing of $d$ -electrons take place in presence of strong field ligands such as $C O$ or $C N^{-}$ .

In $C r (C O)_{6}$ molecule 12 electrons are contributed by $C O$ group and it contain no odd electron

$[C r (C O)_{6}]$

$4 s$

diamagnetic

$[F e (C O)_{5}]$

$4 s$

$4 p$

$3 d$

diamagnetic

$[C r (N H_{3})_{6}]^{+ 3}$

Paramagnetic

Coordination Compounds - Result Question 65

Solution:

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Coordination Compounds - Result Question 65

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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