Which among the following is a paramagnetic complex? (At. no. Mo=42, Pt=78, Co=27 )

Correct answer: C. [CoBr_4]^ 2- [CoBr_4]^ 2- is a paramagnetic complex due to the following reasons: arrow Br is a weak field ligand arrow All tetrahedral complexes are high spin arrow The low spin arrangement has 5 unpaired e^ - in d -orbitals

NEET 2013

Exam: NEET
Year: 2013
Subject: Chemistry
Chapter: Coordination Compounds

NEET 2013 · Chemistry · Coordination Compounds

Which among the following is a paramagnetic complex? (At. no....

Which among the following is a paramagnetic complex? (At. no.

\mathrm{Mo}=42, \mathrm{Pt}=78, \mathrm{Co}=27

)

Options

A\left[\mathrm{Co} $\left(\mathrm{NH}_3\right)_6\right]^{3+}$
B $\left[\mathrm{Pt}(e n) \mathrm{Cl}_2\right]$
C $\left[\mathrm{CoBr}_4\right]^{2-}$
D $\mathrm{Mo}(\mathrm{CO})_6$

Correct answer

C. $\left[\mathrm{CoBr}_4\right]^{2-}$

Step-by-step solution

\left[\mathrm{CoBr}_4\right]^{2-}is a paramagnetic complex due to

the following reasons: \rightarrow

\mathrm{Br}

is a weak field ligand \rightarrow

All tetrahedral complexes are high spin \rightarrow

The low spin arrangement has 5 unpaired

\mathrm{e}^{-}

d

-orbitals

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