The value of $x$ which appears in the complex $[Ni(CN)_4]^x$ is

Write the $IUPAC$ names of the following coordination compounds:
$(i)$ $[Co(NH_3)_6]Cl_3$
$(ii)$ $[Co(NH_3)_5Cl]Cl_2$
$(iii)$ $K_3[Fe(CN)_6]$
$(iv)$ $K_3[Fe(C_2O_4)_3]$
$(v)$ $K_2[PdCl_4]$
$(vi)$ $[Pt(NH_3)_2Cl(NH_2CH_3)]Cl$

The $IUPAC$ name of $[Co(NH_3)_5NO_2]Cl_2$ is .....

The brown ring complex compound is $[Fe(H_2O)_5(NO)]SO_4$. What is the oxidation state of iron in this complex?

Determine the oxidation state of $Cr$ in $[Cr(NH_3)_4Cl_2]^+$.

According to $IUPAC$ rules,the name of sodium nitroprusside is .......