In the spectrochemical series, the positions occupied by the ligands $Cl^{-}$, $OH^{-}$, and $CN^{-}$ in increasing order of their crystal field splitting power are:

According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is

The correct order of the following complexes in terms of their crystal field stabilization energies $(CFSE)$ is:

In which of the following octahedral complex species the magnitude of $\Delta_0$ will be maximum?

If $[Cu(H_{2}O)_{4}]^{2+}$ absorbs light of wavelength $600 \ nm$ for $d-d$ transition,then the value of octahedral crystal field splitting energy for $[Cu(H_{2}O)_{6}]^{2+}$ will be $..... \times 10^{-21} \ J$. (Nearest Integer)
(Given: $h = 6.63 \times 10^{-34} \ Js$ and $c = 3.08 \times 10^{8} \ ms^{-1}$)

Number of complexes with an even number of electrons in $t_{2g}$ orbitals is -
$[Fe(H_2O)_6]^{2+}, [Co(H_2O)_6]^{2+}, [Co(H_2O)_6]^{3+}, [Cu(H_2O)_6]^{2+}, [Cr(H_2O)_6]^{2+}$