Calculate the number of unpaired electrons in the following gaseous ions: $Mn ^{3+}, Cr ^{3+}, V ^{3+}$ and $T i^{3+} .$ Which one of these is the most stable in aqueous solution?
Gaseous ions | Number of unpaired electrons | |
$(i)$ | $Mn ^{3+},[ Ar ] \,3 d^{4}$ | $4$ |
$(ii)$ | $Cr ^{3+},[ Ar ] \,3 d^{3}$ | $3$ |
$(iii)$ | $V ^{3+},[ Ar ] \,3 d^{2}$ | $2$ |
$(iv)$ | $Ti ^{3+},[ Ar ]\, 3 d^{1}$ | $1$ |
$Cr ^{3+}$ is the most stable in aqueous solutions owing owing to a $^{t_{2g}^{3}}$ configuration.
Which of the following compounds is metallic and ferromagnetic ?
Which of the following is not correct
Which of the following have maximum number of unpaired electrons
Which of the following pair of transitional elements exhibit highest and lowest density
What can be inferred from the magnetic moment values of the following complex species?
Example | Magnetic Moment $(BM)$ |
$K _{4}\left[ Mn ( CN )_{6}\right.$ | $2.2$ |
$\left[ Fe \left( H _{2} O \right)_{6}\right]^{2+}$ | $5.3$ |
$K _{2}\left[ MnCl _{4}\right]$ | $5.9$ |