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)
$6$
$5$
$3$
$4$
Which of the following is used as white pigment
Why does copper not replace hydrogen from acids?
$Cr^{+2}$ has a magnetic moment same as that of
Which of the following ionic species will impart colour to an aqueous solution
The number of unpaired electrons in $Z{n^{2 + }}$ is