The complex $[Pt(NH_3)_6]Cl_4$ furnishes $.......$ ions.

Which of the following is a $\pi$-acid ligand?

The total number of ions present in $K_4[Fe(CN)_6]$ is .....

The $NO$ molecule,

On complete reaction of $FeCl_3$ with oxalic acid in an aqueous solution containing $KOH$,the product $A$ is formed. The secondary valency of $Fe$ in the product $A$ is $...$ (Round off to the nearest integer).

$A$ complex salt can be formed by the combination of $[Co^{III}(NH_3)_5Cl]^X$ with which of the following?