Which of the following compounds will exhibit coordination isomerism?

Which of the following compounds may show optical activity?

The electronic configurations of $Cr^{2+}, Mn^{2+}, Fe^{2+}$ and $Ni^{2+}$ ions are $3d^4, 3d^5, 3d^6$ and $3d^8$ respectively. Which of the following aqua complexes exhibits the minimum paramagnetic behavior?

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 is expected to be a paramagnetic complex?

Select the diamagnetic coloured compound: