In $K_4[Fe(CN)_6]$,the primary valency of iron is .........

$A$ $2 \ L$ solution is prepared by mixing $0.02 \ mol$ of $[Co(NH_3)_5SO_4]Br$ and $0.02 \ mol$ of $[Co(NH_3)_5Br]SO_4$. If $1 \ L$ of this mixture $X$ is treated with $AgNO_3$ to give $Y$,and another $1 \ L$ of mixture $X$ is treated with $BaCl_2$ to give $Z$,find the moles of $Y$ and $Z$.

The anion of acetylacetone $(acac)$ forms $Co(acac)_3$ chelate with $Co^{3+}.$ The rings of the chelate are

Which of the following is an example of a hexadentate ligand?

The name of the ring structure complex compound formed between a metal ion and a polydentate ligand is . . . . . . .

The ligand present in lithium tetrahydroaluminate is........