The spin-only magnetic moment of cobalt in $Hg[Co(SCN)_4]$ is....

Identify the incorrect match from the following:

Given below are two statements:
Statement-$I$: $[Fe(ox)_3]^{3-}$ is chiral.
Statement-$II$: $trans-[Cr(H_2O)_2(ox)_2]^-$ is chiral.
(Given: $oxH_2 = HOOC-COOH$)
In light of the above statements, choose the most appropriate answer from the options given below:

The number of geometrical isomers found in the metal complexes $[PtCl_2(NH_3)_2]$,$[Ni(CO)_4]$,$[Ru(H_2O)_3Cl_3]$ and $[CoCl_2(NH_3)_4]^+$ respectively,are :

The spin-only magnetic moment value of $M^{n+}$ ion formed among $Ni$, $Zn$, $Mn$, and $Cu$ that has the least enthalpy of atomisation is $........$ (in nearest integer). Here $n$ is equal to the number of diamagnetic complexes among $K_2[NiCl_4]$, $[Zn(H_2O)_6]Cl_2$, $K_3[Mn(CN)_6]$, and $[Cu(PPh_3)_3I]$.

$[Co(NH_3)_5Br]SO_4$ and $[Co(NH_3)_5SO_4]Br$ are examples of which type of isomerism?