The charge on the $[Ag(CN)_2]^-$ complex is:

$A$ coordination complex compound of cobalt has a molecular formula containing five ammonia molecules,one nitro group,and two chlorine atoms for one cobalt atom. One mole of this compound produces three moles of ions in an aqueous solution,and upon reacting with an excess of $AgNO_3$,it forms $AgCl$ precipitate. The ionic formula for this complex would be:

According to Werner's theory,the primary valency of a central metal ion is:

The number of precipitable halide ions in the sample $[Pt(NH_3)Cl_2Br]Cl$ will be

The ligand $N(CH_2-CH_2-NH_2)_3$ is : $-$

Which one of the following forms a complex with an excess of $CN^{-}$ (cyanide) having a coordination number of two?