The value of 'spin only' magnetic moment for one of the following configurations is $2.84 \ BM$. The correct one is:

$A$ metal complex with a formula $MCl_4 \cdot 3NH_3$ is involved in $sp^3d^2$ hybridisation. It upon reaction with excess of $AgNO_3$ solution gives '$x$' moles of $AgCl$. Consider '$x$' is equal to the number of lone pairs of electron present in the central atom of $BrF_5$. Then the number of geometrical isomers exhibited by the complex is $............$

Which of the following complexes is an example of the type $MA_4BC$ diastereoisomers?

In $Cr^{2+}, Mn^{2+}, Fe^{2+},$ and $Ni^{2+}$,the number of electrons in the $3d$ orbital are $3d^4, 3d^5, 3d^6,$ and $3d^8$ respectively. Which of the following aqueous complexes will have the lowest magnetic moment?

Identify the ionization isomer of $[Cr(H_2O)_4Cl(NO_2)]Cl$.

Which of the following has a magnetic moment of $1.73 \, B.M.$?