Which of the following ions are diamagnetic ?
$Cr^{+3}$
$Fe^{+3}$
$Zn^{+2}$
$Mn^{+2}$
Ammonia is a Lewis base. It forms complexes with cations. Which one of the following cations does not form complex with ammonia
While filling up of electrons in the atomic orbitals, the $4s$ orbital is filled before the $3d$ orbital but reverse happens during the ionisation of the atom. Explain why ?
The colour of copper sulphide is
Write a note on oxides and oxoanions of transition elements.
Which one of the following properties is not of transition elements