The ability to form complex compounds by the transitional metal ion is due to
Small size
Vacant $'d'$ orbitals
High nuclear charge
All of these
Triple degenerate $d-$ orbitals are exactly half-filled in
To obtain steel entirely free from sulphur and phosphorus, the process used is
$\operatorname{Zr}\,(\mathrm{Z}=40)$ and $\mathrm{Hf}\,(\mathrm{Z}=72)$ have similar atomic and ionic radii because of :
The spin only magnetic moment value of the ion among $\mathrm{Ti}^{2+}, \mathrm{V}^{2+}, \mathrm{Co}^{3+}$ and $\mathrm{Cr}^{2+}$, that acts as strong oxidising agent in aqueous solution is .......... BM (Near integer).
(Given atomic numbers: $\mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}: 24$, Co: $27$)
Which of the following match is INCORRECT :