The $3d$ metal ions form coloured compounds because the energy corresponding to the following lies in the visible range of electromagnetic spectrum
Free energy change of complex formation by $3d$ metal ions
$d - d$ transitions of $3d$ electrons
Heat of hydration of $3d$ metal ions
Ionisation energy of $3d$ metal ions
Which of the following set of elements does not belong to transitional elements set
The spin magnetic moment of cobalt in the compound $Hg[Co{(SCN)_4}]$ is
In the series $Sc(Z = 21)$ to $Zn(Z = 30)$ , the enthalpy of atomization of _____ is the lowest
Which of the following is a colourless ion
A compound of a metal ion $M^{x+}$ $(Z = 24)$ has a spin only magnetic moment of $\sqrt {15}$ Bohr Magnetons. The number of unpaired electrons in the compound are