The given complexes are .......

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(A) The given structures represent the $cis$ and $trans$ forms of a coordination complex with the general formula $[M(en)_2A_2]$.In the first structur

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Geometrical isomers

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(A) The given structures represent the $cis$ and $trans$ forms of a coordination complex with the general formula $[M(en)_2A_2]$.In the first structure,the two $A$ ligands are on the same side (cis-position),while in the second structure,the two $A$ ligands are on opposite sides (trans-position).Since these structures differ in the spatial arrangement of ligands around the central metal atom,they are known as geometrical isomers.

Complexes	No. of unpaired electrons
$A. [CrF_6]^{4-}$	$P. 5$
$B. [MnF_6]^{4-}$	$Q. 2$
$C. [Cr(CN)_6]^{4-}$	$R. 1$
$D. [Mn(CN)_6]^{4-}$	$S. 4$

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The correct match is:

Complexes No. of unpaired electrons

$A. [CrF_6]^{4-}$ $P. 5$

$B. [MnF_6]^{4-}$ $Q. 2$

$C. [Cr(CN)_6]^{4-}$ $R. 1$

$D. [Mn(CN)_6]^{4-}$ $S. 4$

Which of the following complexes has the maximum number of unpaired electrons?

The magnetic moment (spin only) of $[NiCl_{4}]^{2-}$ is ....... $B.M.$

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