Question

Among $VO_2^+$, $MnO_4^-$, and $Cr_2O_7^{2-}$, the spin-only magnetic moment value of the species with least oxidising ability is _____________ BM (Nearest integer).(Given atomic number $V = 23$, $Mn = 25$, $Cr = 24$)

Answer 1

Correct Answer: 0

For 3d transition series:

\[ \text{Oxidising power: } V^{+5} < Cr^{+6} < Mn^{+7} \]

For \( V^{+5} \):

\[ [\text{Ar}] 4s^0 3d^0 \]

Number of unpaired electrons = 0

\[ \mu = 0 \]