Which of the following have maximum number of unpaired electrons
$Fe^{3+}$
$Fe^{2+}$
$Co^{2+}$
$Co^{3+}$
Which of the following is not a transition metal?
Transition metals show paramagnetism
Among $\mathrm{CrO}, \mathrm{Cr}_2 \mathrm{O}_3$ and $\mathrm{CrO}_3$, the sum of spin-only magnetic moment values of basic and amphoteric oxides is . . . . . . . . $10^{-2} \mathrm{BM}$ (nearest integer).
(Given atomic number of $\mathrm{Cr}$ is 24 )
On adding excess of $N{H_3}$ solution to $CuS{O_4}$ solution, the dark blue colour is due to
Which of the following ions has the least magnetic moment