The number of unpaired electrons in $Z{n^{2 + }}$ is
$2$
$3$
$4$
$0$
Solder is an alloy of
The catalytic activity of the transition metal and their compound is due to their
Chloro compound of Vanadium has only spin magnetic moment of $1.73\, BM$. This Vanadium chloride has the formula
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 )
Which of the following imparts green colour to the glass