The number of unpaired electrons in ferrous ion is
$5$
$4$
$3$
$2$
Stainless steel is an alloy of iron with
Which element can have oxidation state from $4 $ to $6 $?
Prussian blue is due to the formation of
Which of the following electronic configuration would be associated with the highest magnetic moment?
Among $Co ^{3+}, Ti ^{2+}, V ^{2+}$ and $Cr ^{2+}$ ions, one if used as a reagent cannot liberate $H _{2}$ from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is $......B.M$. (Nearest integer)