How many $EDTA$ molecules are required to form an octahedral complex with a $Ca^{2+}$ ion?

$H_2N - CH_2 - CH_2 - NH_2$ acts as a:

Which of the following species is $NOT$ a monodentate ligand?

In the complex $[E(en)_2(C_2O_4)]NO_2$,the oxidation state and coordination number of the element $'E'$ are respectively (where $(en)$ is ethylenediamine):

The number of water molecule $(s)$ not coordinated to copper ion directly in $CuSO_4 \cdot 5H_2O$ is

Select the correct statement about the given complex $[Co(NH_3)_4Cl_2]Cl$.