Which of the following statements is correct?

Which of the following complexes is diamagnetic and tetrahedral?

Select the correct code about complex $[Cr(NO_2)(NH_3)_5][ZnCl_4]$:
$(I)$ $IUPAC$ name of compound is pentaamminenitrito$-N$-chromium$(III)$ tetrachlorozincate$(II)$
$(II)$ It shows geometrical isomerism
$(III)$ It shows linkage isomerism
$(IV)$ It shows coordination isomerism

The sum of the total number of $Cr-O$ bonds in chromate $(CrO_4^{2-})$ and dichromate $(Cr_2O_7^{2-})$ ions is:

Given below are two statements.
Statement $I$: In $CuSO_{4} \cdot 5H_{2}O$,$Cu-O$ bonds are present.
Statement $II$: In $CuSO_{4} \cdot 5H_{2}O$,ligands coordinating with $Cu(II)$ ion are $O$- and $S$-based ligands.
In the light of the above statements,choose the correct answer from the options given below.

Three arrangements are shown for the complex $[CoBr_2(NH_3)_2(en)]^{\oplus}$. Which one is the wrong statement?